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People with advanced melanoma are living longer thanks to treatments that target cancerous cells or encourage the immune system to wipe out the tumour.
Melanoma is most common in light-skinned people, but it can also afflict those with darker pigment. Finding out why would help to explain the disease's origins.
People with sickle-cell disease experience bursts of debilitating agony from birth. But researchers have made a promising discovery that could ease these excruciating episodes.
Millions of people around the world rely on rice as the bulk of their daily diet. This snapshot of the crop's production, consumption and trade shows an overall surplus, but population growth in future decades may affect the situation, writes Emily Elert.
Africa's newfound taste for an old grain has experienced problems — drought, low yields and costly imports. But new projects are driving the continent towards self-sufficiency.