Children have become the focus of a political storm as millions prepare to return to school amid the coronavirus pandemic.
Primary schools in England are meant to reopen from June 1, starting with Years R, 1 and 6.
But unions and some whole cities are staging a revolt, warning there is not yet enough evidence that it's safe.
The key questions are whether children are infected like adults are; whether they then spread the virus to others; and whether they're less likely to get seriously ill and die.
The science is still evolving, and papers from the government's scientific advisors are expected to be published in the coming days.
But we do already have some hints about what the evidence shows.
These have come in several forms, but here in England we've had two very helpful updates in recent days.
They are an overview of scientific advice from the Department for Education, and an update from England's Deputy Chief Medical Officer, Prof Jonathan Van Tam.
They both say children could be as likely to get infected as adults; but that when they are infected, they're much less likely to get sick.
The key question for reopening schools, though, is how much children transmit the virus to others - and here's also where the evidence is hazy.
Here is what Prof Jonathan Van Tam and the Department for Education have said.
Can children become infected with coronavirus?
Yes.
Government scientists believe younger children - aged up to 11 or 13 - might be less susceptible to getting infected with coronavirus.
But they warn the “degree of confidence is low” - meaning they can’t be sure one way or the other.
Prof Van Tam said emerging data suggests the rate at which children become infected is “about the same as in adults, possibility a little lower in the younger children”.
Is coronavirus as serious in children as adults?
No.
When children get Covid-19 it’s usually a “much more mild” disease than in adults, Prof Van Tam said.
It is pretty well established that if they get coronavirus, young children are far less at risk of falling very ill or having to go to hospital.
Medical experts believe up to 100 children in the UK have been affected from a condition similar to Kawasaki disease, which has been linked to coronavirus.
However, the exact nature of any link is still being investigated and Prof Van Tam said we are talking about “very very very small numbers” of children.
How much do children transmit coronavirus to adults?
Some studies suggest younger children may transmit the virus less than adults.
But "this evidence is mixed and provides a low degree of confidence at best”, the government says.
England's deputy chief medical officer Professor Jonathan Van-Tam added the data is "pretty sparse at the moment”.
But he agreed that initial findings appear to be that children transmit coronavirus less than adults.
He said: “The experts have already had a look at this and formed a conclusion that unlike influenza, where we are very clear that children drive transmission in the community to adults, it really does not seem to be the same kind of signal with Covid-19 - that children are not these kind of big, high output transmitters as they are with flu.”
