Do polar bears get confused when they see brown bears?

Rather than being confused by brown bears, Polar bears have a very consistent reaction to them. They are terrified by their brown cousins. Even a relatively small grizzly…

If the current US Navy were to lose one Nimitz aircraft carrier in a battle, how quickly could that aircraft carrier be replaced?

Currently, the USN has 9 carriers active. I am considering only carriers that are in a deployment schedule. Carriers in rework, i.e. refueling or major maintenance, are not…

Why didn’t Alexander the Great conquer China?

If Alexander came to China, he would have come from the West. Suppose his entire force made it through the Taklamakam deserts. Then he would have run into…

Which animals can never be tamed? And why?

1.The zebra is one of the most surprising animals we have never tamed. In fact, in a sense, it’s quite surprising. After all, horses and donkeys have been…

Why don’t the Chinese just build their own lithography machines or get one clandestinely and then reverse engineer it?

We do. But we made a mistake in believing “free trade”. When Western countries found themselves not as compititive as Chinese companies, they destroyed their “rule based world…

Why did the Black Death “disappear” after 1352?

Black Death was virulent and deadly. As such, everyone got it and you either lived (unlikely but possible) or died (most likely) By the middle of the 14th…

Why don’t we send a Hubble-type space telescope out to orbit Pluto or Uranus so we can get better pictures of deep space stars and solar systems?

Pluto is, in astronomical terms, right on top of us. It is only 0.000628 light years to Pluto. This is Barnard’s Galaxy. It is one of the nearest galaxies to…

How did World War 2 era diesel submarines have such exceptional ranges of over 21000 miles while similarly sized ships only had ranges of around 6000 miles?

A lot of good answers, but only one of them even remotely mentioned a specific trick that US WW2 Submariners did to get extra range, and by the…