>
2 Hours of Retro Sci-Fi Christmas Songs | Atomic-Age Christmas at a Snowy Ski Resort
Alternative Ways to Buy Farmland
LED lights are DEVASTATING our bodies, here's why | Redacted w Clayton Morris
Travel gadget promises to dry and iron your clothes – totally hands-free
Perfect Aircrete, Kitchen Ingredients.
Futuristic pixel-raising display lets you feel what's onscreen
Cutting-Edge Facility Generates Pure Water and Hydrogen Fuel from Seawater for Mere Pennies
This tiny dev board is packed with features for ambitious makers
Scientists Discover Gel to Regrow Tooth Enamel
Vitamin C and Dandelion Root Killing Cancer Cells -- as Former CDC Director Calls for COVID-19...
Galactic Brain: US firm plans space-based data centers, power grid to challenge China
A microbial cleanup for glyphosate just earned a patent. Here's why that matters
Japan Breaks Internet Speed Record with 5 Million Times Faster Data Transfer

The Falcon 9 has 10 engines. One nine-engine first stage and a single engine second stage.
The Falcon Heavy has 28 engines. Three nine-engine cores and a single engine second stage.
SpaceX should soon be pretty perfectly recovering the first stages and the fairing and other parts. Only the single-engine second stage will not be recovered.
If 2018 production was 400 engines. Then ten Falcon 9 and ten Falcon Heavy could be produced along with extra single-engine second stages.
In 2018 and 2019, SpaceX could produce twenty reusable Falcon 9 and ten Falcon Heavy's along with 220 expendable second stages.