Walking through a postcard – Experiment

What’s the effect?

You cut a hole in an A5 piece of paper large enough for someone to climb through. (This is a good follow on activity from the “Coin through an impossible hole“.)

You will need:

  • A piece of A5 paper
  • Scissors


What’s the method?

Start by folding the A5 piece of paper in half lengthwise (see photo 1).

Now make cuts in the piece of paper starting from the folded edge and stopping 1cm from the opposite edge. You want the cuts to be spaced by about 1cm. The result will look like a paper comb (see photo 2).

Now turn the piece of paper around and make cuts from the opposite side. These cuts are made in between the cuts you’ve previously made. Again stop cutting 1 cm from the edge. You will now have created a zig zag shape as in (photo 3).

The next step (also shown in photo 3) is to carefully cut along the folds you made at the start. However, you want to leave the folds on the left and right edges intact. When you’ve completed these cuts and carefully unfolded your creation it should look like photo 4.

By carefully pulling the paper apart you will have created a large hole in the middle (see photo 5). You can then climb through it or have a volunteer climb through. You need to watch the paper doesn’t catch on clothing or it will tear easily.

This is a good activity when teaching about perimeter and area.

Coin through an impossible hole – Experiment

What’s the effect?

A 2 pence coin is pushed through the hole made by a 1 pence coin.

You will need:

  • A piece of paper
  • 1x 2p coin and 1x 1p coin
  • Scissors
  • Paper/pen


What’s the method?

The series of photos above outlines how to do this. Start by drawing around the 1p coin with the pen or pencil. Then carefully cut out the hole with the scissors (see photo 2).

The challenge is then to push the 2p coin through the 1p coin’s hole. Which would seem impossible as the hole is clearly too small (as can be seen in photo 3).

To achieve the impossible… fold the paper in half, with the fold going directly across the hole’s diameter. Then insert the 2p coin into the paper (see photo 4).

The hole still seems to small but if you pinch the paper and fold the paper in such a way so that the curved hole begins to get straightened out (see photo 5) eventually you’ll reach a point where the 2p drops through the hole.

This is a good way of introducing the idea of circumference and diameter.

Two things that made me go “wow” today

1) A lovely demonstration of combining water and sound waves. The pictures and video are gorgeous. Looking forward to trying this out myself. See the details here: http://www.thisiscolossal.com/2013/03/this-is-what-happens-when-you-run-water-through-a-24hz-sine-wave/  

2) A real-time world map of Tweets. Worth looking at this on a large screen and wait to see the network patterns to emerge. See the details here: http://www.tweetping.net/

“Science Month”

Apologies for the severe lack of updates in 2013. The last term has been really busy due to school bookings, house buying, illness and bad weather.

Last month in the UK it was National Science and Engineering Week (NSEW) but that spills over into the whole of March. I did 45 shows in the space of three weeks and stacked up 1,000s of miles of travelling. Surviving was a feat of endurance. However, it did mean I got to repeat the same shows multiple times in a short period of time. I’ve managed to add and improve the content. Really excited about the direction the Superhero and Magical Maths shows are going.

Currently I’m on a two week break from presenting. A time to relax, dream and plan for the upcoming term. Highlights include: running a session at the Science Communication Conference on “How not to present science”; a session at the BIG event (British Interactive Group) on “Hindsight”; shows and training in Warsaw; Buxton Fringe festival (my 7th show there).

I also plan to add a lot more content to this blog.