Floating Flower Tip - Most flowers float pretty well on their own until they start to pool with water and slowly sink. For a longer lasting centerpiece, use bubble wrap to make little skirts for your flowers.
A quick trick to test the doneness of your beef. The fleshy part of your palm mimics the tenderness of your beef. For example, if you like your steak rare, your beef should be as soft as your palm while it's wide open and relaxed.