How hummingbirds remember when flowers refill

Hummingbirds remember when individual flowers will refill

8 flowers

Rufous hummingbirds can remember when as many as eight separate flowers should refill with nectar. Instead of repeatedly checking empty flowers, they can wait and return when enough time has passed.

Slavery persisted despite legal bans

~40 million people

In 2019, an estimated 40 million people worldwide were enslaved, even though slavery was illegal in every country. Children made up 26% of that total.

France created a government with no easy way out of a deadlock

After the French Revolution, France created a government called the Directory. Its leaders could not simply call new elections, while lawmakers could block their plans. When the two sides became stuck, the system had few peaceful ways to solve the conflict, so the government repeatedly turned to decrees and the army.

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How hummingbirds remember when flowers refill

Hummingbirds remember when individual flowers will refill

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