Category Archives: Pajamas Science

Waterproofing experiment

I have purchased a pair of warm and beautiful “snow boots” for Neva. First time she wore them outside – she came back home with soggy feet. The boots were useless! Or were they? Before throwing them away I thought I’d try something. And a waterproofing experiment was born.

You will need

– useless shoes (or any other item that might benefit)

– two pieces of fabric (or you can get more pieces and extend experiment with different substances/materials

– a candle

– a hairdryer

Rub your fabric with piece of candle so that it becomes much lighter colour and as much wax as possible rubs off (you can see it much better on darker fabric). Then blow on it with hairdryer on the hottest setting (you can see the colours returning to normal as wax melts into it.

To test – drip some water onto your piece of fabric to see if it it stays on the surface.

We used 2 handkerchiefs – one was rubbed with wax and other wasn’t. We wrapped both of them over a small pot and fixed with rubber band before dripping water on them (to collect the drips).

We waterproofed the boots as well, as you can see from the picture – the water sits on top without soaking in. Next week we’ll test how well that worked, on the slopes of Bulgaria.

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Posted by on February 23, 2018 in Pajamas Science, Uncategorized


Bottle tree

I chanced to buy a complete storybook of “My naughty little sister” in a charity shop and one of the stories was called “Bottle Tree”.
Almost two months ago we did an experiment with acorns – we planted a few in soil in pots and, of course, we had to try “the bottle tree”, which is basically a seed, suspended over water on toothpicks.
Today we have noticed the leaves on one of our Bottle Trees.
This was one of the six acorns we experimented on. The ones in soil didn’t stand a chance – no matter how many times I remind them – girls cannot remember to water the plants.



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Posted by on December 27, 2017 in Pajamas Science, Pyjama Science



Hot days in the garden

Hot days in the garden are definitely over. It turning very blustery here, but we’ll remember the fun and will repeat it next summer.

I have prepared this one day in advance with my younger child. She enjoyed pouring water into ice lollies moulds, choosing food colouring and dropping the colours in, watching the colouring drop to the bottom (when we shortly talked about density) then stirring the colour to dissolve it in the water. We didn’t have many colours of food colouring, so we used some old dried-out markers (washable) to make the colours that we wanted by dipping the nibs into ice-lolly moulds. I was expecting them to draw on paper, so I thought it would be ok. Don’t use anything that cannot be ingested if your child still puts everything in the mouth. I didn’t tell her what it was for.


Then we put them in the freezer. Next day I taped a piece of paper on a cardboard in the garden brought the ice moulds out, warned girls that these were not for eating and demonstrated how to draw on paper. They were very involved to begin with. As ice started melting slightly we did a bit of Pollack – I showed them how to do splats.

It was very hot and they were running around with not much on (hence not many pictures in this post), so it didn’t take much time for them to try painting with ice lollies on themselves. They wrote ABC and numbers on themselves, taking turns to write on each others backs and guess the letter or a number, then just started crazy painting their feet and hands and doing prints. You should’ve heard them laughing!

Definitely something I recommend doing!

Some colours came out very dull, I seem to be very unlucky with my food colouring. Can anyone recommend a brand of food colouring that produces great bright results?


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Nature studies

On our rumblings through a nature park with friends we picked up some frogspawn on Sunday. I have never hatched or grown frogs at home before, all I remember from my childhood there were always tons of them in the country house, and a few were always swimming in our water butt (don’t ask me how they were getting there), so I had a chance watching them develop.

I was very happy to have found the frogspawn, so after we got home – I found an empty jar, added some rainwater, some pond weed from the local pond and scoured our home library for books and our toys for frogs.

Here’s our new Nature shelf


And here are our future froggies on their 4th day


Some of them are out of their slimey eggs and just floating about, and the eggs are floating about by themselves. I know they are supposed to eat their eggs but that needs to happen before they are out. So either I am misinformed or I accidently forced them out of the eggs while pouring them in, adding water and weed etc. Not sure what to do with empty eggs, leave it or take it out? Maybe they still need to feed on it?

Mya is keeping a journal and drawing spawn’s progress in it, as she doesn’t like to write.



Gooey Stretchy stuff

We went today to a Science Zone workshop Gooey Science today. Girls were reluctant to go (in a funny sort of mood, not sure why) but enjoyed it at the end. They did a few experiments there – girl’s favorite I think was Elephant’s toothpaste. There were a lot of ooohs and ahhs and general screeching, which always means success. At the end Mya excitedly told her dad “we were making foam from living creatures!!!” – I am not revealing any more, you have to go to their workshop!

Gooey science at Science Zone UK - little scientists at work

Gooey science at Science Zone UK

One of the experiments, however, reminded me something we made about a year ago, and I never actually published it on the blog, so here’s a copy of my old Facebook post.

We made this slime today.

We played with it for 2,5 hours! I had as much fun as Mya

This is really streeeeeeetchy And rolly and really glittery! Glitter galore!

We were watching how gravity was stretching it. We tried wrapping it round things

And were experimenting how long it will stretch before breaking off

This is what we made it from. I didn’t give it to the toddler she still puts things in her mouth.

Glittery slime supplies

Glittery slime supplies

We put it in a empty butter spread plastic tub and played with it on many occasions. It is still playable, 1 year after.

It doesn’t stick at all, the only thing that stays on the hands is glitter and it’s difficult to wash to washing liquid off the hands – they keep being “soapy”

The only fail with this is it smells a lot with washing liquid, I wouldn’t give it to a younger child due to it being made with washing liquid – prolonged contact might be not good for the skin. I chose to use Formil Non-Bio washing liquid as most of the recipes of that type call for Borax or Liquid starch, and none of them appear to be available in UK to general public nowadays, so it was interesting doing the recipe with Borax at Science Zone to see the difference. The one we made at Gooey Science today was more rubbery (some of it even bounced!), easily tear-able and less stretchy and was sticking to the hand much more initially, but still was lots of fun.

What is your slime recipe? Please share your pictures and links!


Pajamas Science – Rainbow Jar

Most of the times I manage to do set up anything educational with my kids nowadays is happening either on holidays or weekends, and mostly in the mornings. When pajamas are still on and there’s no need to go anywhere fast.

Yesterday the day started slowly with lots of books and playing, then I remembered about a Density of Liquids Rainbow Jar experiment I wanted to do with girls. Found on Playdough to Plato

I couldn’t find some of the ingredients in UK (I think the blog is American), so I substituted them with what I could find. Some thing worked, some didn’t but at the end it turned out not so bad!

Here is what we used and how we started the experiment

I put out all of the supplies and scales and explained that we are going to do a little experiment and make a Rainbow Jar (I showed her the picture, so she was interested in the end result)

  1. A tall jar (I think ours was too big, choose taller and narrower one, so you don’t have to use too much materials.
  2. Honey
  3. Clarke’s Carob Fruit syrup (closest I could find to Corn Syrup)
  4. Fairy green washing up liquid
  5. Olive oil
  6. Water
  7. Absolute Vodka (closest I had to Rubbing alcohol)
  8. Food coloring
  9. A dropper


I gave Mya 2 jars with only a few marbles in one and full of marbles in the other and asked what she can tell me about them. She said that one had less marbles and other had more. We weighted them and came to conclusion that the one with more marbles was heavier.

I explained that everything is made from molecules – just like these marbles, but so tiny that you can’t see them. All our liquids that we are going to use are made of molecules too, and some of them have more molecules in them so they are heavier than the others, and the heaviest things will stay at the bottom.


We started with honey (no measures of how much of anything you should use – just enough to have a nice thick layer). Then we colored Carob syrup purple and poured that in – carefully, right in the middle. It was difficult for Mya not to pour it down the sides so I had to guide her hand (in pouring most of the liquids, as I didn’t want to spoil the  result of experiment and put her off the future ones). She wasn’t very happy with that. I don’t know why I didn’t think of using a funnel.. Duh!

Next – in went dishwasher liquid, followed by some water in colored blue. After water- we poured in some Olive oil and last went in Vodka colored in red. You’re not supposed to pour that one down the middle, but instead drop it down the sides with a dropper. Mya tried it first, but it was going everywhere, so I took this one over as well. This one didn’t go well – no matter how I tried – it went under the layer of oil and didn’t want to stay on top. My guess is – it wasn’t a good substitute for Rubbing alcohol, and was probably heavier than needed, or we weren’t careful enough pouring it in. Nonetheless – it turned out not so bad, and Mya has a basic understanding of molecules.

Be careful not to shake the jar – this will spoil the carefully arranged layers.

During the experiment Mya enjoyed mixing food coloring in and pouring liquids, Neva (2,3) enjoyed opening all the bottles, pouring marbles from one container into another, eating cheese and anything else I put on her plate for distraction and singing Rainbow song we made up. She wasn’t bothered by the rainbow jar. She wanted to drink Vodka…

I put the bottle back into the cupboard. I might need it for cleaning up courage….




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