For the physics olympics I built a bridge out of toothpicks. My dad (an engineer) and I discussed different tactics to make it strongest and then I built it. Anyway, my bridge was awesome. It weighed less than 300 grams, maybe it was less than 100 (I can’t remember)...but it was super light and it held almost 140 pounds. My dad came to watch me put weight on it and he was on the edge of his seat, just as scared as me when I was putting the weight on. It’s a great memory of my dad, he passed away 7 years ago, this is a special memory for me.