Not enough for sure. You don't know because you did not live in the time. Polio was so common then people understood it's effects so it would be like if he were blind commending that the president is still blind. I believe that FDR's crippled (the normal word then) state was known to the average man. Just there are some who are oblivious to almost anything. Anyone and everyone at the time looking at this Yalta photo would have understood what the crossed legs meant. It is not subtle. In any case was your point that the press can help underplay something fairly obvious? Yes and that is no revelation to anyone. Regarding your other mention of Michelle Obama.. labeling her transsexual or gender was a slow news day at Breitbart or Infowars. Just made up and plainly so. Conspiracy brain gibberish leads to flat-Eartherism and Scientology.
I didn't know my history when I was in kindergarten. But when I reached first grade, at age 6, I was surprised how long I didn't know Roosevelt fell cripple. I only knew about the "new deal" from my Dr. Zuess books.
What Lindberg did back in the war time is echoed in the present. Hitler's all American hero. But don't get lost in false equivalency, both sides are not equally deficient. Not by a long measure. https://www.express.co.uk/expressyourself/201613/Charles-Lindbergh-Hitler-s-all-American-hero An article @Poindexter would do well to read.
By "the media" I did not mean every publication, every time. I mean the media, like the Yalta pic, that, for whatever their reasons (forced, compliance, voluntary, complicit), together, as a block, if not a majority, played it down enough to delay the general dissemination of the facts. The Yalta pic is what high school kids would see in history class, and to the average kid, nothing is obvious, or anything other than what it was meant to appear to be. This does apply to today's media, like the media that brought Roosevelt to power, as it covers for the Democratic candidate (or President) to make them appear as they want to appear. Some media then mentioned Roosevelt's condition, and some media today mentioned the possibility, if not the probability, the first lady was a male-to-female trans. And not just Infowars or Brietbart. The flags (pun intended) are there to see. There is some there there. You don't know she is not, and if you don't drink enough coffee, you, anybody could get quite close, and still not know the difference.
"You don't know she is not"..read the link FF provided about Russell's teapot. https://www.snopes.com/fact-check/stanley-ann-dunham/ Intersex are infertile and men don't get pregnant. But hey, don't let that get in the way of a good conspiracy nonsense. Trump is doing appalling damage to the US.
Thanks for agreeing that proof of nonexistence is proof of a negative. I expected an argument about semantics. As for your "challenge," Canadian schools are good; you should have paid more attention. Which partially explains why you have nothing better to do than stick your nose in our business. Wiles didn't prove Fermat's Last Theorem until the early 1990s. Meaning, not knowing how to prove something does not necessarily mean it can't be proven. Or that it carries over to other "negatives." And even though some negatives can't be proven, it doesn't mean none can. Because it's a fact that infinitely many negatives can be.
A couple, who appear to be man and wife, are allowed to adopt. So you still don't know. The problem is not trans, trans marriage, or adoption. The problem is deception.
Emm... @Poindexter, what do you think? Does seem like a very long and complicated deception. Do you recon they did all of this faking baby bumps etc. while planning to become POTUS also?
Just my opinion -- from what I saw over their 8 years, the Obamas are good parents. Their politics, OTOH, I totally disagree with. But that's another matter entirely.