In the UK - Brainiac! Quite low brow really, but bringing hi tech to the hoi polloi. They manage to blow something up every episode - usually a caravan plus other stuff, but they come up with amusing experiments like:

How many CO2 fire extinguishers would it take to make a man hover? (didn't really work, but they propelled a guy in a wheelchair pretty fast)
If you jump off the ground every time an electric fence is charged, do you get a shock (obviously the answer is no...if you time it right)

and many more