What are vaccines, how do they work and why are people sceptical?

Vaccines help save the lives of millions a year. This is how they came about - and why they matter.

from BBC News - World https://bbc.in/2x1LTBh
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Watch: Earthquake interrupts Mexico's president during press conference

The 6.5 magnitude trembler shook buildings and set off the country's earthquake alert system. from BBC News https://ift.tt/tYnBCcT