When two (super massive) black holes collide, and the collision is even slightly off-center, the energy released by the collision can give the resulting black hole a considerable kick. Suppose two black holes of 1.6-billion-solar mass collided, they would convert 112 million solar-mass from mass to energy, according to this collision calculator: https://www.omnicalculator.com... . That much energy, if not released perfectly symmetrically, can give any object a large kick.

From the article at minnesota.publicradio.org :

During the growing season, researchers will heat the air and soil inside the open-topped chambers. They'll also raise carbon dioxide levels, exposing plants and trees to the changes.

The chambers aren't biodomes since they're open at the top. This means there will be plenty of fresh air, but temperature and CO2 levels can be raised by adding heat and CO2.

This raises questions as to [...] whether the mistreatment of workers deserves to be highlighted when considering such firms.

Are you serious, asking this question? Not only does it always deserve to be highlighted, it must be.

Do you want to own a product that was produced by mistreated workers? Or do you just not care about that?

I know that if I am to buy something, I want it to be produced by workers who are being treated fairly, with decent working conditions and decent pay. If that means paying more for a product, then so be it.

In the program run to process form input, I check the HTTP_REFERER header sent by the client. It should exactly match the URL of the form that was being posted, if it doesn't, then you know that someone is accessing the input program illegally, i.e. they aren't using your form.

Yes, except for people like me who use some sort of proxy that always sends a fake referer header.

What does my program do when it detects a bot? It returns a 403 Forbidden error and adds the ip address of the client to .htaccess with a "Deny from" directive.

And that would deny me the chance to reconfigure my proxy to send your site a correct referer header and try my submission again.