A 13th-century fresco rediscovered in Ferrara, Italy, provides unique evidence of medieval churches using Islamic tents to conceal their high altars. The 700-year-old fresco is thought to be the only
In a factory in a smoggy corner of China’s inland Shaanxi province, the country’s world-leading solar industry is on display. Robots scoot around carrying square slices of polysilicon, a crystalline s
Prolonged illnesses like cancer and chronic infections often leave the immune system in a state of exhaustion, where its frontline defenders — T cells — lose their ability to function effe
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