Science lessons in most Welsh schools are good but assessment isn't robust enough, according to school inspectors.
Estyn also says sometimes, in primary schools, teachers pass on their science misunderstandings to pupils.
The Welsh Government welcomes the report which it says is broadly positive.
More top news
Catch up with Wednesday's Wales at Six here
Showers will ease and it'll be a dry night for most with clear skies and chilly feeling temperatures.
Hollie Kerrell, 28, was last seen in Knighton on Sunday 22 April. A 35-year-old man has been arrested on suspicion of murder.