Murphy's Law, mouth ulcers and MSG

This episode of Science with Dr. Karl addresses a range of listener questions, starting with the nature of the universe's center, which Dr. Karl clarifies doesn't exist as a single point but rather originated from a singularity that expanded everywhere simultaneously. Callers inquire about MSG's safety, the cold sensation of evaporating liquids, duckling development, redheads' anesthetic needs, and Vegemite's potential to heal mouth ulcers. The discussion also covers how insects survive floods and bushfires, the science behind Murphy's Law, the effect of temperature on perceived sweetness, the composition of snot, and the implications of altering the speed of light. Finally, Dr. Karl weighs in on the benefits and drawbacks of five-toed shoes.