Spotting ancient walls at 17,000 MPH

Great Wall of China
Photo by Tianxiaozhang.

“You know, you can see it for miles – goes on for miles, over the hills and everything. But, so does the M6. Do you know what I mean? You can see that for miles. And you go, ‘Great. And that does a job. You can drive on that.’” Thus did an unimpressed Karl Pilkington of An Idiot Abroad describe the Great Wall of China, allegedly the only manmade object visible from space.

Which raises and interesting question: Why can’t you see the British M6 motorway from space? Or can you? For that matter, can you actually see the Great Wall?

Great Wall of China: Only Manmade Object Visible from Space?

We’re going to need a bigger island

Crowd at hockey game
Photo by Sreejith K.

Sometime around Halloween 2011, the global population topped seven billion. That’s a staggering number of people. In fact, linked arm to arm, a human chain would wrap around the equator roughly 175 times or extend to the moon and back about nine times, according to CBC/Radio-Canada.

Bearing this image in mind, we can be forgiven for believing that there are more humans roaming the Earth today than during all of history and prehistory combined. But is it true?

Are There More People Alive Today than Ever Lived?

My Coke runneth over

Diet Coke and Mentos geyser.
Photo by Michael Murphy.

They say you can’t un-break what’s broken, un-see what you’ve seen or put the toothpaste back in the tube. But can you un-shake a can of soda? More to the point, does tapping the top, slapping the sides or flipping the can end-over-end make a difference?

I’ll tell you what I found out, but some of you might not like the answer ….

Does Tapping a Soda Can Prevent it from Foaming Over?

In a microwave, still waters run deep – and dangerous

Michael Bay's microwave
Tick-tock.

In case you’re wondering, yes, microwaves are magic and, yes, they are trying to kill you. Take that seemingly innocuous cup of water that you just heated for your afternoon tea. Shouldn’t that be bubbling by now? After all, you nuked it for an awfully long time.

Come to think of it, what do you really know about that microwave?

Can Water Explode in a Microwave?

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