Dating all the way back to Neolithic times, the mortise and tenon is the oldest wood joint known to mankind. While the specific provenance of the joint is unknown, I'm willing to bet the inventor wasn't a virgin. NSFWIn the thousands of years since, craft
Determine remaining daylight on your hand. Use this simple trick to measure the remaining daylight without a watch. Count the finger widths between the sun and the horizon. Each finger is equivalent to 15 minutes, with each hand totaling an hour.