Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

Saturday, May 16, 2015

the avocado lives!

who: the avocado tree (our youngest baby?)

Well, for all of you who were anxious about the fate of our avocado tree, you can breathe a sigh of relief. The current stats and observations from the 3 Js:

  • height (soil to top): 99cm/38 inc 
  • Widest leaf 11cm/4.25 inch 
  • Longest leaf 26.5cm/10.5in 
  • Diameter 51cm Longest branch (excluding leaves) 25cm
  • The pit is now black/dark brown/same color as the soil (from J3)

Unfortunately, we are now unable to measure many of our original stats: mass, total length from roots to highest shoot.

Someone, I think J3, even made a little video of the tree:

Sadly, our attempt to grow a sister tree at Grandma's house was unsuccessful, the avocado pit didn't sprout while we were there and the side project had to be abandoned. There was an ambitious little grapefruit seed trying to make progress on its own, so perhaps Grandma or Grandpa will be able to provide an update of that.

Wednesday, May 13, 2015

Cake is wonderful

who: J1 and J2
where: kitchen
when: afternoon during J3's nap
what material did we use: dish soap, water, a plastic drink bottle, zometool set, and two small blocks of solid CO2

Last weekend, a generous uncle brought two pieces of chocolate cake for the older J's (littlest J can't eat dairy, so has to make due with dark chocolate squares). The cake was nice, but the real delight was in two small pieces of dry ice that we part of the packaging to keep the cake cool. While J2 had his violin lesson, J1 and I looked for good activities to take advantage of this bounty.

We hit on the Crazy Russian Hacker's 8 dry ice activities (video linked below). Of those, we selected the smoke bubbles and the smoke rings since they seemed cool and possible with our resources. These turned out to be really easy and fun activities.

Here are some videos of the smoke rings:



By coincidence, our friend Pongskorn Saipetch was also playing with dry ice recently, you can see his video here. From the size of his piece of dry ice, I have to guess he had a lot of cake!


After the dry ice had melted, we made bubble wands out of zometool and continued to play with the soapy water:


Our video inspiration. While our photos and video didn't turn out this well, the actual experience was at least as much fun as what you see here:

Monday, January 12, 2015

Shooting to the moon (observational botany 4)

who: J2 and J1
where: dining room floor
when: Sunday morning

Time for another update on our plants.

Orange Seeds
The bad news is that our orange seeds aren't making any progress.  Unknown to me, J1 had been putting the seeds out in the direct sun for several hours each day. This has possibly cooked the seeds. It is possible they weren't fertile in the first place. Of course, it is also possible they will still manage to sprout. We haven't tossed them out yet.

Avocado
The avocado has been a clear success. Since the last post, we hit the stage where the sprout was 6 inches long. This was the point our original instructions suggested we cut back to 3 inches. We were wondering why? After some searching on the internet, we concluded that most growers don't prune back at this stage and the purpose of doing so is to encourage a shorter, more bushy plant suitable for growing indoors. J1 and J2 were both keen to get the plant to grow as tall as possible (100 meters!) so we decided not to prune.

Some quick observations:
  • J1: it is 25 cm tall
  • J2: it has tertiary roots!
  • J1 and J2: is that white stuff on the roots mold?
Ah well, even if it mold, the plant seems unaffected for now.


Root observation

We spent part of the morning sketching the roots. J1 was initially resistant, suggesting we should just work through technology ("why don't we just take a picture?") and that he had already drawn a picture of plant roots ("I already did that for school!") I explained that I was planning to draw the roots so I could practice close observation and asked if I could use his microscope. Telling him why I was going to do it seemed a very effective rhetorical strategy.

Here are our drawings:

AR1 by J1

AR1 By J2 (right) and J0 (left)

Avocado drama of the week
Our little baby is going touring this week! Well, actually just to school for one day, then back home the next.  Will it return intact?

Friday, January 2, 2015

Secondary Roots appear (observational botany 3)

Who: All J1 and J2
Where: at the dining table
When: after dinner (observations from 28 December/day 27)

More progress on the avocado sprout. We had to transfer the pit as our previous glass bowl was too shallow and started to restrict the growth of the main root. Pictures courtesy of J1 this time.

Overview
Close-up of the split

Root view
Attention has drifted?


Observations
J1
  • if we measure from outside the pit, the sprout is about 1 inch tall
  • the sprout outside of the pit is light green with some red dots
  • off of the main sprout, there are 6 tiny sprouts that look like little thorns, 4 above the pit and 2 inside
  • there are also some black lines on the pit (J0 note: these are from where we cut the original avocado)
  • the main root is flexible, the sprout only flexes a bit along the crack of the pit
  • the secondary roots are more flexible than the main root.
J2
  1. the avocado sprout looks like J1's nose (no one else agreed with this observation)
  2. the part of the sprout inside the pit is white
  3. the root has 5 pooplish (J0: what is this? J2: it is a little cm, daddy)
  4. the toothpick are 5 peebolo (
Measurements:
the whole rig: 550 g
the rig less the pit: 486 g
from which we conclude that the pit plus 3 toothpicks: 64 g (unchanged from last measurement)

length of stem above the pit: 3.2cm (doesn't directly compare with our previous measurements)
length of main root below the pit: 2.9 cm (almost 1 cm longer than last time we measured)

Note: 3 days later on the 31st, the lengths were 6.5 cm above the pit and 14.5 cm total length. There was a striking and obvious growth spurt.

Sunday, December 28, 2014

Sprouting! (observational botany 2)

Who: All Js
Where: at the dining table and in front of our house
When: after lunch (observations from 19 December/day 18)

Avocado

Our avocado pit has made some progress.



J1's observations
  • the root has sprouted
  • maybe it is actually upside down and the avocado is confused?
  • the pit split in the middle.
  • there is a sprout in the middle
  • some of the pit has peeled off
  • the exposed pit is a bit more rough than when we examined it last week. it feels like bumpy wax.
J2's observations
  1. Maybe it is actually upside down and the avocado is confused?
  2. the avocado pit looks like it is going to poop on us (referring to the emerging root)
  3. the exposed pit is smooth
  4. the calculator is 9.5 cm long
J3's observations <made at dinner, had been napping while the older two discussed>
  • There's a plant!
  • These are floss, we use it to clean our teeth (gesturing to show how)
  • Oh, some of the *this* fell off (noticing that dried skin from the pit was in the bottom of the water bowl from when one of the older two peeled it off and dropped it in).  
We also had a discussion about the division of the pit into two halves. When we started, there wasn't any clear indication that it would cleave along this line. We were wondering if there was some mechanism to prevent it from cleaving where we placed a toothpick, if the splitting location is random, or if there is a clear place it will split. I guess we add these to our curiosity list.

Measurements
3 toothpicks: 0 gr on our scale, indicating that they are less than 1/2 gram
The avocado pit and 3 toothpicks together was 64 grams (J2 noted this is 8 x 8)

The sprout in the middle of the pit and extending down was 4.5 cm long.
J0's nose is 6 cm long
J1's nose is 4.5 cm long, so the same as the sprout.
From end to end, the pit and root sprout are 7 cm.
The root protrusion is 2 cm.

When we started, we estimated the pit's mass 56 grams, (J2 remarks, 56 = 7.4833147 x 7.4833147)

J1 measured me with the tape measure and proclaimed that I have 101 kg of fat. His reasoning: some 
distance around was 101 cm and he assumed I must be 1 kg per cm of perimeter along that slice.

J2 added, the following.
6 = 2.4494897
4.5 = 2.1213203
I asked J2 if these square roots had any meaning, in the context of our seed. He said, "no, it is just for fun."

Introducing: Orange seeds

Last sunday (13 December) we planted some orange seeds. Vaguely following these instructions, we used two methods:
  1. Planting in soil, keeping the soil covered and most: no developments yet
  2. Planting in a pool of water with some soil and dried leaves: interesting developments this week
Our "interesting" case this week

So, what happened with the soaking seeds? Here are our observation notes:
  • Oh, the seeds are sprouting!
  • Hmm, the sprouts seem to be wiggling!
  • Those aren't sprouts, they are larvae, probably mosquito larvae
  • Ooh, it smells like cows. It stinks
We poured it out on the street in front of our house, in the sun, and watched the water dry out. We observed the larvae moving around in the small puddle of mud as it dried and talked about what they needed to survive. J2 noticed that there was a storm drain a meter away from the puddle and asked what would happen if they went down the drain. Then we talked about whether the could get to the drain (having to cross a meter of dry ground) and how they could know that there was a safe destination on the other side. We made conjectures about their senses and ability to communicate:
  • probably cannot see/no eyes
  • probably cannot talk, but we guess the do have a mouth to eat
  • not sure about ears
  • cannot read or write
  • no ability to communicate with adult mosquitos, ants, humans, or other creatures
In summary, we concluded that their knowledge is restricted to the limited part of the universe that their limited senses can observe directly. Can you see the editorializing?

As you might expect, fire was introduced at some point in the conversation, we ended up burning a handful of dry leaves and some paper scraps. As you do, you know.

Wednesday, December 17, 2014

Observational botany (step 1)

Who: All Js
Where: at the dining table (for future reference, this post has notes from 1 december 2014)
When: 5 minutes a day, before dinner


The author of Five Triangles made a suggestion somewhere (maybe his/her other blog?) that a great science activity is to plant a seed and make observations of the developing plant for a year. We are starting this with an avocado pit.

The pencil is a stand-in until our dental hygiene
catches up to our scientific zeal


J1's observations

  • The pencil smells like okra
  • It's red gray
  • It feels like my hair
  • I think it is 5 cm long
  • I estimate the mass is 1trn grams

J2's observations

  • The avocado pit smells like okra
  • It feels like your poop (J0:"My poop or your's?" "Your's daddy")
  • It is 36 feet (J0:"Long, tall, or wide?" "Every dimension")
  • It weighs 1000 pooplizes (J0: "what is 1 pooplize?" "The mass of all humans on the earth put together.")
As you can see, someone wasn't really taking this seriously

J3's observations

  • This is floss (pointing) and this is floss (pointing again) and a pencil (pointing for a third time).
  • It is not symmetrical
  • One side is round and the other is pointy (indicating the side down in the water as round and the end pointing up as pointy)
  • It is smooth
  • it has no smell
J3 also asked for the pencil I was using to take notes, then drew some scribbles on the page and said she was drawing avocado pits.

Measurements
We made the following measures of mass:

  • Empty bowl: 107 gr or 3 3/4 oz
  • Pencil: 4 gr or 1/8 oz
  • Dry pit+bowl+2 toothpicks+pencil: 167 gr or 5 7/8 oz
  • water added: 133gr 

By implication, the pit and 2 toothpicks is 56 grams.

References:
A general procedure for growing your own avocado tree (don't expect to eat the fruit, though);
http://www.californiaavocado.com/grow-your-own-avocado-tree/

As usual, wikipedia has something useful to say (my emphasis added):

Usually, avocados are grown from pits indoors. This is often done by removing the pit from a ripe, unrefrigerated avocado. The pit is then stabbed with three or four toothpicks, about one-third of the way up. The pit is placed in a jar or vase containing tepid water. It should split in four to six weeks and yield roots and a sprout. If there is no change by this time, the avocado pit is discarded. Once the stem has grown a few inches, it is placed in a pot with soil. It should be watered every few days. Avocados have been known to grow large, so owners must be ready to repot the plant several times.

In other news
Doesn't the icosidodecahedron look oddly, asymmetrically misshapen?