The postage rate for a letter in 1693 was determined through how much light could pass through the letter. The postage rate would be more expensive if less light went through, and this process was called candling.

The first hot air balloon flight traveled for 5.5 miles over Paris and lasted for 23 minutes.

For every ton of fish that is caught in all the oceans on our planet, there are three tons of garbage dumped into the oceans.

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