In an impassioned address to officials from countries supporting Ukraine, Mr. Zelensky said “a new chapter” would be starting for Europe and the rest of the world, requiring even more cooperation.

The W.N.Y.C. science program “Radiolab” partnered ... a tight orbit with the dwarf planet. A new simulation suggests how it ended up there. The Mars Sample Return effort was billions of ...

Altruism values for treatments of rare, severe pediatric diseases have not been estimated. This study found the altruism value for a hypothetical new Duchenne muscular dystrophy treatment to be $80 ...