An inventor from Snowdonia has received a donation of $1.4m from Microsoft founder Bill Gates to develop a fridge that keep vaccines cool without using electricity.
ITV News first met Ian Tansley in 2011, when he demonstrated the technology for the first time.
The fridges - which can operate for weeks without needing power - are currently in operation in more than 30 countries.
The money will allow the Tywyn-based firm to start trials in East and West Africa.
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Mrs May and Mr Corbyn both paid tribute to the RAF engineer who died after a Red Arrows jet crashed at RAF Valley on Anglesey yesterday.
Strong north easterly winds over the past few weeks have blown the sand off the beach and onto the huts at Abersoch.