Did the Mongol invasion of Poland lead to diplomatic relations with England?

What is the deadliest* month in human history?

Did 50000 Jews really gather in Moscow in 1948 to see Golda Meir?

How did one "look up" an answer before the internet?

do you guys think there is a problem in african studies?

Trading options in the 1600s was well utilized during the Tulip Bubble and trading the Dutch East Indies stock. Do we know how they set prices without knowing volatility/time decay etc, bell curve distributions or Black Scholes modeling? Was their option pricing very inaccurate vs today’s models?

English longbowmen during the Hundred Year's War earned 6 pence a day. A single arrow cost 0.3125 pence, so you'd start losing money on the 20th arrow. That doesn't seem like a lot when battles could last multiple hours. Are there accounts or archers refusing to put themselves in the red?