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TIL the propellers of single engine aircraft are angled slightly to the right.

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R7jdw TIL coins like pennies actually have no odor. Metals such as iron & copper catalyze a chemical reaction in skin oils which produces the source of the "metal smell", a compound called 1-octen-3-one, and every person's smell is slightly different.
R77Zj Earlier this year, a NASA-led team conducted a series of carefully choreographed flights over California in order to sniff out how aircraft emissions differ when using petroleum fuels or biofuels. Early results from the Alternative Fuel Effects on Contrails and Cruise Emissions (ACCESS II) experiment confirm that blended biofuel is the cleaner-burning fuel.
eYB4 TIL that a cowlick is called a cowlick because cows lick their young and cause spiral patterns in their coat.
WOL4 TIL that in 1912, Teddy Roosevelt was shot in the chest while campaigning, but the bullet was slowed by a steel eyeglass case and a 50-page speech. After determining the bullet hadn’t pierced his lung, Roosevelt proceeded to give his 90 minute speech as planned.
E1Y5x TIL that Home Depot stocked shelves with empty boxes instead of actual merchandise in its early days. Home Depot persuaded the vendors to give them empty boxes after the vendors were afraid that Home Depot could not pay them for all the merchandise.