No. 411Ages 5 to 7
Baking Soda Volcano
The classic fizzing eruption in a tray, with red lava that bubbles up and over on cue.
No. 412Ages 3 to 5
Rainbow Milk
One touch of washing-up liquid sends food colouring swirling into a bright, moving rainbow.
No. 413Ages 7 to 11
Grow a Crystal
A week of patience turns a jar of sweet water into a sparkling crystal you can keep.
No. 414Ages 5 to 7
Floating Egg
An egg that sinks in plain water bobs right back up once a little salt joins in.
No. 415Ages 7 to 11
Invisible Ink
Write a secret message in lemon juice, then reveal it with a little gentle warmth.
No. 416Ages 7 to 11
Bouncy Egg
Three days in vinegar dissolves the shell away and leaves a wobbly egg that bounces.
No. 417Ages 5 to 7
Static Electricity
Rub a balloon on a woolly jumper and watch it lift paper, and your hair, all by itself.
No. 418Ages 5 to 7
Seed in a Jar
Tuck a bean against the glass and watch a whole plant wake up, root and shoot on show.
No. 419Ages 5 to 7
Walking Water
Coloured water climbs up paper bridges and meets in the middle to make a brand new colour.
No. 420Ages 5 to 7
Cloud in a Jar
Warm water, ice and a puff of mist make a real little cloud swirl to life inside a jar.