I keep seeing a misconception that transmission lines are made out of copper. For the vast majority of lines (especially overhead), that's not the case. Most power lines are made from a steel core wrapped with aluminum conductors. (that's why power lines look silvery and not coppery) Steel provides the strength, and aluminum provides the conductivity. (they both provide some of each but that's primarily how it works) But isn't copper more conductive than aluminum? For the same cross sectional area, aluminum is only about 60% as conductive as copper, but it's also only 30% as dense as copper. For the same mass of metal, aluminum is about twice as conductive as copper. Copper is better when you're space constrained (like in an electric motor), but aluminum is better when you're weight constrained. Aluminum isn't just a cost saving measure (although it does cost 1/4th as much per kg). For a lot of applications, aluminum is actually better than copper.

🚨 Absolutely wild scene in California — a police chase ended with car theft suspects running on foot across a packed freeway 😳⁠ ⁠ Choppers overhead, cops everywhere, and drivers just frozen watching it all unfold.⁠ ⁠ Only in Cali…⁠ ⁠ https://t.co/zohj4q8TR2

🇺🇸 STARLINK JUST GOT STRONGER: SPACE-BASED CELL SERVICE IS COMING FOR DEAD ZONES Last night, SpaceX launched 23 more Starlink satellites, including 13 Direct to Cell (DTC) beasts, adding muscle to their plan to erase cellular dead zones from the map. Whether you’re hiking in the Rockies or sailing the Pacific, the dream is simple: full bars, anywhere. This was SpaceX’s 48th Falcon 9 mission of 2025 (and the 31st Starlink launch this year alone—Elon doesn’t sleep). Booster B1063 landed gracefully on the ‘Of Course I Still Love You’ droneship for its 15th round trip. With 7,000+ satellites now buzzing overhead—over 570 of them DTC-capable—SpaceX is inching closer to global cell service, teaming up with T-Mobile, KDDI, and Rogers. They’re just 4 launches away from finishing the initial DTC constellation, meaning that no bars on your phone might soon be a thing of the past. Source: @SpaceX, @Starlink

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