Jumping straight to the Wikipedia citation:

> Jacobs 2019a, citing Nguyen et al. 2019: "Internal correspondence showed how tobacco executives, barred from targeting children for cigarette sales, focused their marketing prowess on young people to sell sugary beverages in ways that had not been done before."

> Dyson 2019, citing Nguyen et al. 2019: "Big tobacco companies once used tasty flavors, bright colors and other techniques to lure young smokers. Then they began buying soft drink companies in 1963 and started using the same strategies to sell sodas and other sugary drinks, according to a study published Thursday in the British Medical Journal. ... 'Executives [at R. J. Reynolds and Philip Morris] had developed colors and flavors as additives for cigarettes and used them to build major children's beverage product lines, including Hawaiian Punch, Kool-Aid, Tang and Capri Sun', said [co-author] Schmidt[.] ...'The Wacky Wild Kool-Aid style campaign had tremendous reach and impact', said ... Nguyen[.] '[T]he Kool-Aid kid program was modeled after a tobacco marketing strategy designed to build allegiance with smokers.' ... The tobacco company also purchased Capri Sun and Tang, and used similar child-centric marketing strategies to push sales"

The short answer is blackbody radiation. Everything naturally glows a little bit, and that glow changes with its temperature. At "room temperature", it's in the infrared (Planck's Law). As temperature increases, so does that frequency of the radiation. If the tuning fork was heated to 500ish degrees Celsius, it would glow a dull red.

The center of your vision is less sensitive to dim light (but much better at seeing color) than the periphery, so averted vision is looking at the blank space next to a dim thing you want to see, so that the sensitive part of your eye sees the dim thing

This is awesome! Can I suggest WREK Atlanta, 91.1FM? http://streaming.wrek.org:8000/wrek_live-128kb

Left on the dial, right on the music