witches' brew

The "witches' brew," as the report calls it, flowing out of these refineries poses a real threat to aquatic life and communities.

Male anxiety and overcompensation have further befouled this witches' brew.

"It's a witches' brew of different factors to consider when you're trying to estimate herd immunity at this point," said Michaud.

The witches' brew from Shakespeare's "Macbeth" even cited "slips of yew, silvered in the moon's eclipse" as a main ingredient.

Not content with that, Prof Poliakoff and Mr Barnes then placed a second new fiver in a beaker and filled it with "fuming nitric acid" - a "witches' brew" of nitric acid plus dinitrogen tetroxide.