Let's make this birthday one to remember.

76 years old (Born on August 29, 1948)

Happy Birthday, Charles D. Walker! You're the only payload specialist we know who can engineer a spacecraft and still find time to explain rocket science at parties without putting anyone to sleep. Your adventures aboard Space Shuttle Discovery remain legendary—after all, not everyone gets paid by McDonnell Douglas for floating around in zero gravity!

Here's wishing you another year filled with stellar achievements (and fewer encounters with space food). May your birthday be as extraordinary as orbiting Earth—and may your cake stay firmly grounded on its plate this time! Keep inspiring us earthlings; you're truly out of this world!