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TIL that it takes four or five generations of monarch butterflies to complete the annual migration from Mexico to northern USA/Canada in the spring but in the fall a single "super generation" completes the entire 3,000 mile journey.

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ne7yB TIL 97% of French Cognac is exported to the USA, where the majority of consumers are African-American. WWII soldiers stationed in France returned to America with a taste for it - and by the 50s, Cognac companies marketed directly to the Black middle and upper classes through Jet and Ebony magazine.
jG0R TIL that two of the world’s largest rivers, the Amazon and the Rio Negro, meet but do not mix and are visually distinct but occupy the same body of water. This is due to the rivers’ different speeds and temperatures.
XEJE TIL the reason why you occasionally can receive radio stations from cities far outside their normal broadcast range. A phenomenon called Tropospheric Ducting acts like a lens, bending the radio waves and greatly extending the normal reception range.
kJW4e TIL of Australian Senator Bill Heffernan, who in 2014 felt that the new security arrangements at Parliament House were inadequate. To protest this, he smuggled in a fake pipe bomb and presented it at a Senate hearing as proof that the building was "no longer secure".
0wAQL TIL that in 1946 John Boyd Orr, a Scottish scientist, proposed the creation of a World Food Board to repel world hunger and protect global peace. The proposal was rejected as UK and USA refused to support it. As he resigned from his role in the UN, he warned that “food is more than a commodity."