By William C. Shelton

On Saturday, people marched on six continents and in 600 cities in support of science. One of those cities was Boston. The following are from signs seen on the Boston Common.

There is no Planet B

Science, not silence!

Got Polio? Me neither. Thank you, Science.

The oceans are rising, and so are we

Empirical data Trumps imperial alt-facts

In peer review we trust

If you’re not part of the solution, you’re part of the precipitate

PhD Chemist will work for food

May the facts be with you

Don’t piss off the nerds

Evidence-based policy, not tweets

Without science, it’s just fiction

Think while it’s still legal.

Dear Climate, You’ve changed.

President Trump: Scientists invented your tan

Schrödinger’s cat grabs back

Think like a proton: Stay positive

Science is what made America great in the first place

Mr. President, I know bacteria who are more cultured

Denial is not a policy

Stop denying the earth is dying

Before you dismiss Science, Mr. President, here is the molecular formula for hairspray

Defiance for science

We are not just mad scientists. We are really pissed off!

Grab them by the data

Don’t inherit the Earth from your ancestors. Borrow it from your children.

I am with her  [Pointing to planet earth]

Anti science = pro cancer

If you can’t handle the facts you should not be in office

Science-informed policy; not policy-informed science

Not usually a sign guy, but geez!

When opinion Trump’s fact, Americans lose

The world needs love, and love needs chemistry

Thank God for evolution

The nuns taught me about climate change