It was the end of December 2019 when reports of a new flu like infection first came out of China. Within weeks millions of people were in lockdown as the virus took hold around the world.

In this programme we look back and revisit the scientists who were ready, those who had been studying bat coronaviruses and warning of their pandemic potential.

The scientific response was immediate. The coronavirus tests now used across the world were being developed within a few hours of news of the outbreak in China, and the vaccines we now have licenced for use began to be formulated just a few days later.

At Christmas, is there a better gift than knowledge? CrowdScience has cooked up its own version of 'secret Santa', with members of the team setting one another the challenge of answering surprising questions from all over the world.

Are humans the only animals to exercise? Can you get colder than absolute zero? Why are sounds louder at night? When it comes to food dropped on the floor, is there such thing as the "three-second rule"? And, does honey really have healing properties?

Producers and presenters from the CrowdScience team speak to all manner of experts, from zoologists through to material scientists, to find the answers.

(Image: Getty Images)