A Chinese researcher’s vision of serving spicy crawfish soup to astronauts on Mars became an unlikely symbol of Washington’s growing anxiety over China’s scientific ambitions at a US Senate hearing on Tuesday. Drew Endy, associate professor at Stanford University and director of bio-strategy and leadership at the Hoover Institution, said that last autumn he met a 20-year-old Chinese researcher from Shanghai at a scientific conference in Paris. Dressed in a large red crawfish costume, the young...