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If you’ve had a minor stroke or a transient ischemic stroke (TIA), taking the clot-preventing drug clopidogrel along with aspirin may lower your risk of having a major stroke within the next 90 days, according to new research published in The New England Journal of Medicine.

Ecologists have long known that agricultural and sewage pollution can cause low oxygen conditions and fish kills in rivers. A study published today in Nature Communications reports that hippo waste can have a similar effect in Africa’s Mara River, which passes through the world renowned Maasai Mara National Reserve of Kenya, home to more than 4,000 hippos.

For decades, researchers have thought that access to food determined the brood size of birds. Now, biologists at Lund University in Sweden have discovered a completely new explanation: the body temperature of small birds can increase by more than 4°C to exceed 45°C when they are feeding their young. Larger broods would require more work, resulting in even higher body temperatures - something the birds would probably not survive.

With the arrival of spring, we look forward to the return of hundreds of species of migratory songbirds from their wintering grounds.

New research identifying climate vulnerability hotspots has found that the number of people affected by multiple climate change risks could double if the global temperature rises by 2°C, compared to a rise of 1.5°C.