A chemical that scientists worry might have an impact on human reproduction has been found in rivers across the UK.
Researchers from York University analysed samples from 32 rivers in all the UK's 4 nations and found traces of trifluoroacetic acid (TFA) at 98% of the test locations.
TFA is what's known as a "forever chemical" which means that it breaks down extremely slowly in nature, and so accumulates over time.
As with other "forever chemicals", also known as PFAS, just how much a threat to human health and at what concentrations is still being researched.
But scientists in Germany say having looked at the impact of TFA on animals they want it to be classed as toxic for reproduction.
