Comparing countries, the risk to NHS staff, and birdsong

The lockdown is difficult, but we hope it’s reducing the number of people catching the virus. So, when are we going to be past the worst? We try and compare how successful different countries have been at containing the virus. Mathematical comedian Matt Parker helps us out with a perplexing sum about social distancing. Headlines tell us how many NHS staff and transport workers are dying from the virus, but how does this compare with the general population? And is it just us, or have the birds started singing really loudly?