Pupils have returned to Cwmcarn High School in Caerphilly - more than 14 months after it was shut due to fears over the risk of asbestos.
They have been taught in Ebbw Vale while their school was made safe. And, as Tom Sheldrick reports, today's return means the end of a tough period of upheaval for teachers, parents and pupils.
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The star celebrates beating Justin Bieber into second place as her song becomes a hit again after a performance at the total solar eclipse.
Later in the night cloud will thicken bringing hill fog, mist and some patchy drizzle by the early hours.
The Welsh singer sang her infamous track during yesterday's solar eclipse.