There are a few things you can do to make your mattress firmer. One popular suggestion is to add plywood or an MDF sheet underneath your mattress. This will create a more supportive feel and prevent the mattress from dipping and sagging as quickly.
Fact
Europeans were scared of eating tomatoes when they were introduced.
Scholars think Hernán Cortés brought the seeds in 1519 with the intent of the fruits being used ornamentally in gardens. By the 1700s, aristocrats started eating tomatoes, but they were convinced the fruits were poisonous because people would die after eating them. In reality, the acidity from the tomatoes brought out the lead in their pewter plates, and they actually died of lead poisoning.