I Didn't Know That

An extra-terrestrial I Didn't Know That investigation probes the mysterious forces crafting paranormal patterns in our crop fields. Your mind will boggle at what can be achieved with a bit of wood and a measuring tape.

Richard and Jonny explode back onto your screen with their most spectacular experiment yet. They're comparing the effectiveness and collateral damage of concrete compared to conventional explosives when used in an aerial bomb and the results will blow you away.

Do not try this at home or anywhere else you find sand, water and unpredictable tides. Jonny goes to frightening lengths and depths to find out once and for all whether a person could really drown in quicksand, sparking a dramatic rescue operations.

Exploring alternative energy, Richard and Jonny show how simple it is to make your own power supply - while burning off a few pounds in the process...

Everyday objects, extraordinary science, in episode 10 of I Didn't Know That.

Green guru Joanna Yarrow shows Richard and Jonny how simple changes in the home can save the environment ? and enough cash for a lavish holiday.

Industrial scientists Richard and Jonny race four different green cars to see which lasts the longest on just £1 of fuel in the tank.

Launching into more exciting experiments, Richard and Jonny reveal how a simple stick led to a revolution in rocketry. Also ? another urban myth is put to the test as Jonny tries all the tricks in an attempt to cheat a lie detector.

How machines can read the worst writing ... and in a stark demonstration of mind over matter, Richard attempts to break bricks with his bare hands after just one lesson from a Kung-fu master.

Can a sniper really hit a target more than a mile away with a single bullet? Plus: Richard and Jonny have supermarkets in their sights; how big shops are secretly snaring us into spending more...

Everyday objects, extraordinary science, in episode 10 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 9 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 8 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 7 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 6 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 5 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 4 of I Didn't Know That.

Everyday objects, extraordinary science, in episode 3 of I Didn't Know That.

Can high pitched singing really shatter glass? Our duo enlist the help of an opera singer before heading to a firing range to test the true resistance of bullet-proof glass. Also, find out about Bumper Harris, the one-legged man employed to travel on escalators in Edwardian London to demonstrate ease of usage. In 'Testing Testing' meet Sid the mannequin who is blasted daily with 1,000°C flames to test fireproof clothing. Then Jonny takes an angle grinder to a snooker ball to see what's inside and we go behind the scenes at a soap factory.

In a bid to to find out all there is to know about glue Richard and Jonny recreate the classic 'flying man' wallpaper paste TV ad. Jonny is glued to a board and dangled from a crane above a pool of water. Find out how chairs are tested by robotic artificial human bottoms that each clock up 3.5million 'sit downs' a month. Discover the technology of modern bank notes and the bacteria they harbour. Finally, ever wondered how the writing gets into seaside rock? We show you how.

The first electric drill was patented in 1889 and was designed primarily to drill rock and dig for coal. Watch in slow motion to find out find out how this ultimate boy's toy works.

Ever wondered how a pressure washer cleans such hard to shift material? We take a slow motion look at the factors that come together to make this such an efficient system.

Did you know that the Catherine Wheel was named after St Catherine of Alexandria from the 4th Century? Find out what makes the Catherine Wheel turn and watch as it spins in slow motion.

Some say that you are more likely to be killed by a champagne cork than by a poisonous spider. Find out what causes a champagne cork to pop and watch in slow motion as it happens!

Watch this marvellous gardening tool, with its safe nylon cutting line, in slow motion action!

How exactly do light bulbs work? For being such an important part of our lives, they have a fairly simple design. The modern light bulb, which hasn't changed drastically since Edison's 1879 model, is made up of only a handful of parts.

In order to start a fire, you need some kind of fuel or ignitable material, heat and oxygen. But how do you put a fire out? Watch in slow motion as a fire extinguisher puts out a fuel fire.