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Science, Tech & Environment

A breakthrough may make the mega flow battery commercially viable in the near future

Wind and solar power have the potential to reduce the growth of greenhouse gases and slow the progression of climate change. But since the sun doesn’t always shine and the wind doesn’t always blow, the big hurdle in expanding the use of renewables is the lack of cheap and efficient storage of that energy. That could be about to change.

Lifestyle & Belief

The pope goes to Kenya

Pope Francis is in Nairobi, Kenya, at the start of his first official trip to Africa. He told a gathering of religious leaders in Kenya that dialogue between different faiths is challenging, but essential. BBC East Africa correspondent Ann Soy is following the pope's Africa visit.