Explanations are what science is for. This is a good thing, because quite frankly, science has a lot of explaining to do. 

There are some weird, freaky things out there! But it's all cool in its own way, too. And the more you go hunting for answers to nature's weirdest things, the cooler it all seems. 

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1. Ever seen the inside of a deer's mouth? It's not as velvety smooth as you'd expect. 

1. Ever seen the inside of a deer's mouth? It's not as velvety smooth as you'd expect.
Reddit |  nacrane

Oral papillae made from keratin, the same stuff as your hair and nails, line their cheeks and help them to chew their food. You'll find them in similar animals, like moose, cattle, and camels, too.

2. Just half an ounce of plastic made this crater in a block of aluminum.

2. Just half an ounce of plastic made this crater in a block of aluminum.
Reddit |  [deleted]

It happened to be traveling at 15,000 mph at the time in a simulation of a space-based impact.

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3. In 2012, surgeons implanted the first 3D-printed titanium lower jaw in an 83-year-old woman.

3. In 2012, surgeons implanted the first 3D-printed titanium lower jaw in an 83-year-old woman.
Reddit |  GiorgioMD

And she was home from the hospital just four days later. "The surgery time decreases because the implants perfectly fit the patients and hospitalization time also lowers — all reducing medical costs," one of the doctors said.

4. These large ice crystals formed on a cold day in Switzerland.

4. These large ice crystals formed on a cold day in Switzerland.
Reddit |  simplywing

The molecular structure of ice shows up remarkably well here — it forms hexagonal rings that make hopper-shaped crystals, much like bismuth.