Melting down and recycling existing steel products is a more efficient and sustainable process than mining iron ore to make virgin steel. From the EPA:
Recovering steel not only saves money, but also dramatically reduces energy consumption, compared to making steel from virgin materials. In turn, this reduces the amount of greenhouse gases released in to the air during processing and manufacturing steel from virgin ore.
Hello, homemade vortex canon! Make a tightly closed box with a narrow round hole at the end, hit the sides of the box to compress the air inside, sending the air out with some force. Instant vortex ring!
A firefighter and team head into a two-story home to put out a fire, all recorded with a helmet-mounted camera. Harrowing! But a great example of teamwork, using safety gear, caution and courage, training, as well as a conversation starter about fire prevention and safety tips.