You might know that a googol—the digit 1 followed by 100 zeroes—is a very large number indeed. You might even know that a googolplex—a 1 followed by a googol of zeros—is an even bigger number. But this video helps explain why it's such an insane concept to get your head round.

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How a 3D Printer Helped a Child Breathe Again

When Kaiba Gionfriddo was born, his parents never expected to have to look on, helpless, as his windpipe collapsed daily and stopped him from breathing. They were desperate—so when a team of researchers suggested that a 3D printer could help, they leapt at the chance.

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