Or search by topic
Do they use WiFi or mobile data?
Phones have changed a lot over the years! Look at this picture of a telephone from the 1950s:
How is it similar to phones we have today?
How is it different?
Complete the silhouette of this 1950s telephone:
Make a cube out of straws and have a go at this practical challenge.
Reasoning about the number of matches needed to build squares that share their sides.
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?