Madeleine Finlay sits down with science editor Ian Sample and science correspondent Nicola Davis to discuss three eye-catching stories, including the impact of a powerful psychedelic on depression, answers on the death of Russian opposition leader Alexei Navalny, and an explanation to the mystery of why humans have chins
Number (2): Everything in this space must add up to 2. The answer is 1-0, placed vertically; 6-2, placed vertically.
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