By using two propellers that rotate in opposite directions, a ship can use less energy to move forward. New knowledge means ...
As NASA prepared astronauts for its second mission into space, National Geographic had exclusive behind-the-scenes access for ...
13hon MSNOpinion
Sharkie Swims Off
I let go of Sharkie, my 1979 Euro 635CSi. I wasn’t really driving the car much; my tastes these days really lean more to ...
Background Pulsed field ablation (PFA) has emerged as a promising non-thermal alternative to conventional atrial fibrillation ...
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