Scientific publishing

FILE - This May 20, 2019 file photo shows marijuana plants in a grow room using green lights during their night cycle in Gardena, Calif. According to research released on Wednesday, June 12, 2019, archaeologists have unearthed the earliest direct evidence of people smoking marijuana from a 2,500-year-old graveyard in western China. (AP Photo/Richard Vogel, File)
AP News Staff
June 12, 2019 - 1:11 pm
WASHINGTON (AP) — Archaeologists have unearthed the earliest direct evidence of people smoking marijuana from a 2,500-year-old graveyard in western China. The evidence comes from 10 wooden bowls found in a complex of lofty tombs situated among the Pamir Mountains. Using new techniques for chemical...
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