I realise that it's most improper to read the article on this website, but they actually found that shade by trees was more effective than shade by shelters whi

I realise that it's most improper to read the article on this website, but they actually found that shade by trees was more effective than shade by shelters which are themselves unshaded in reducing heat. This kind of _makes sense_, as the shelter will ultimately act like an oven as it heats in the sun, but isn't all that intuitive. In some cases it was even more effective to stand outside the shelter in the shade cast by the shelter than it was to stand in the shelter!