Sometimes the science guys can change the way you think about lifting.
-Don't think about rep numbers, but consider the duration of your set. Instead of singles, doubles or triples, make your set last as long as the event your training for.
Don't blast out 8-12 reps for hypertrophy, measure the time of your set. Instead pump out slow, steady reps with a pause at the top and bottom and do it for 35 seconds. Next week do it for 45 seconds.
-Instead of thinking about weights in terms of light/heavy, think about moving fast or slow. Heavy weights will move slowly. If you move them faster, you produce more force. Light weights move fast. If you move them slowly, you do more work.
-You've spent every second of your life resisting/lifting against the force of gravity. Every lift you've done has been against this 9.8m/sec/sec acceleration. When you add bands or chains, EVERY LIFT is a new lift. If you adjust the tension, or adjust the chain weight, you've changed the lift again. This will increase your skill.
Some science contradicts other science, or goes against "conventional wisdom." I've read that Test drops off after 40 minutes to an hour too. But like tonton, I'd never stop a workout at 45 minutes if I hadn't done everything yet. So, maybe disregard that one.
But Lifting Heavy Weights First, then lifting lighter weights for more reps after is no joke! Post Activation Potentiation, or whatever they call it now is for real! After the heavy lifting, the light weights just feel and move different. It just works awesome. Doug Hepburn, John McCallum, and Anthony Ditillo(plus who knows who else) advocated it back in the day. Josh Bryant and C. Thibaudeau talk about it now, and today's science backs it up.
There are some more good examples, surely someone has a couple.