Some foods we eat every day can be dangerous—or even deadly—if not prepared correctly. Cassava, a staple in South America, contains compounds that release cyanide. To be safe, it must be soaked and thoroughly cooked before eating.

Some foods we eat every day can be dangerous—or even deadly—if not prepared correctly. Cassava, a staple in South America, contains compounds that release cyanide. To be safe, it must be soaked and thoroughly cooked before eating.