Basically, yes, and in regard to Tesla, many like myself dispute that he invented radio. He did discover electromagnetic transmission but that's all he did. Marconi, by putting Tesla's discovery to use using point to point transmission and detection of intelligence put on the electromagnetic transmission, is indeed the person who invented radio.
Did you honestly think our Educational System would do away with any of their Myths!? I'm sure that they're still teaching them that they came ashore on Plymouth's Rock. Think of all those Tourist dollars. ;-/ Thankfully, this Generation has no fear in calling out the inaccuracies.
I haven't been to a public school for a long time but whether it's politically correct to say so or not, Columbus did discover America. To say someone discovered something isn't always the same as saying that they were the first to discover it. He made it known in Europe. Prior to his discovery it was not known to Europe even though we now know that Vikings had already been to America and obviously the people already living in America knew that they weren't living underwater. Columbus made an important discovery that changed the course of history. That's why we refer to the time before Spanish influence as Pre-Columbian. It was a turning point.