The moment i saw this thread title, i knew exactly how i was going to respond - some of this has already been picked up by others, but here i go anyway -
For over a decade, SST has been dumbing itself down in a lot of ways skewing to a generally younger target audience age range than when they first started. And largely, it's seemed to be more to fight for ratings more than staying true to its educational goals. Even if you do want to aim slighly younger, kids have more resources and are a bit more sophisticated at a younger age (thanks somewhat in part to SST's own advances in education innovation).
So SST has been really needing to step up its game for quite some time. I usually welcome it when they do. For the most part, if/when SST does something a little more advanced, i'm all for it. Mind you i grew up with classic SST that aimed at 2-7 and most kids my age then kept watching for a few more years afterward because it was fun, a part of their lives, and because there was still value in it for them.
Having said all that though, the current science cirriculum they've taken on for season 41 just seems kind of bizarre. Now i don't have children or am involved with an educational career so i have no idea how things have changed since i went to school, so it's entirely possible that things like scientific method are being taught much more earlier on, but this was stuff that usually wasn't really touched on til about grade four or five. So not only is it a bit weird to continually see it being covered so much on SST, but also given how there's a whole other show on PBS mornings (by Henson, no less) covering the same stuff in the form of Sid The Science Kid, it almost seems like overkill.
Still, i always think it's cool when they throw in something a lot of the adults may not even know and given some of the really wack-jobs out there's disdain for science and people almost seeming to relish not being educated or dismissing what's in front of our own eyes (especially in regards to our environment and threats to the human race that could eventually mean our extinction), i am much more thankful than not that SST is taking care of instilling respect for science and the scientific method when they may be getting messages elsewhere that it's silly nonsense. The children are our future and this is a valuable thing to be exposing them too at this particular time. So i'll give them the benefit of the doubt even if it means endless jokes about mispronouncing "hypothesis" or having a harder time telling the difference between SST and Sid the Science Kid (though some similarities i would really welcome - hey, Sesame Street - isn't it time to bring out "Susie" to sing?)