Yes 1%+99%. In order to verify whether Edison's last sentence was "without that 1%, the other 99% were in vain", I made a query.

"Genius is one percent inspiration and ninety-nine percent perspiration."

Edison didn't say the true but frustrating second half of the sentence.

Supplement:

I'm sorry Lz, because I know someone will say "the second half sentence", so I mentioned it by the way.

If you only ask 1% and 2%, 1% is true, and 2% is unheard of.

Besides, someone left out the second half of the sentence, but it didn't.

Inspiration and sweat

Cindy Myers

Thomas Edison said, "Genius is one percent inspiration and ninety-nine percent perspiration."

Without that one percent inspiration, all the sweat in the world is just a bucket of sweat.

The above is the original text of the so-called "missing the second half sentence". Pay attention to the position of quotation marks. Only Edison is in quotation marks. The second half of the sentence is the author's personal opinion and cannot represent Edison.

The second half of this sentence is a classic "rumor", which was originally correct, but the rumor is wrong.