杏吧原创

If 鈥渢he house always wins鈥�, how do professional gamblers make a living?

Grace Benham,

Poole, Dorset, UK

Christopher Columbus鈥檚 expeditions to the Americas brought tomatoes, peppers, potatoes, beans, squash and maize to Europe, but what about the other way? What crops grew in Europe that Native Americans didn鈥檛 have? And what crops were present on both sides at that time?

Eric Kvaalen,

Les Essarts-le-Roi, France

To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.

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