Fresh video shows that one of the most fascinating eVTOL aircraft designs we've seen is now flying at larger scale. The Transwing platform uses a unique dihedral folding wing system to move between ...

Do you think there’s a triangle whose angles measure 41, 76 and 63 degrees? At first, answering this may seem easy. From geometry class we know that the sum of the measures of the interior angles of a ...

Interview with Dutch climber Jorg Verhoeven after the second free ascent of Dihedral Wall, the difficult big wall climb freed in 2004 by Tommy Caldwell on El Capitan in Yosemite, USA. "Climbing The ...

Wunsch’s Dihedral has a reputation as one of the best 5.11 crack climbs in Colorado, and this adventure proves why. From splitter cracks and wild roof sections to the cryptic slab pitch that ...

Four mathematicians have cataloged all the tetrahedra with rational angles, resolving a question about basic geometric shapes using techniques from number theory. The tetrahedron is the simplest three ...