Alright, so over on the MTF forum someone made a post (
https://www.susans.org/forums/index.php/topic,71117.0.html) asking for input about something someone at her work had said, related to "spotting" a TS by the length between finger and index ratio, and whether it's even or not.
Unfortunately, her friend at work has it mixed up, there is a known correlation between prenatal hormone exposure and your 2d:4d ratio, but it's that males tend to have a ratio of 0.96 or less, females a ratio of 1 or higher. A lot of females fall into the higher category, and thus would also have "uneven" fingers and be considered male by that definition.
Index ratio's have found to be correlated with a number of things, personality traits, autism, TS, homosexuality to an extent, maths ability, sporting ability. Studies in the past have shown MTF's tend to have ratios in the normal female range, adding fuel to the biological cause theory.
So anyway, since everyone over on that thread is answering with completely useless trivia, I thought I'd post a thread so we can get some only mostly useless trivia.

My question is this, are you an MTF or an FTM (if neither, sorry I don't have a poll option, but you're more than welcome to post in the thread), which is your longer finger, on your dominant hand (the dominant hand is said to be the better indicator), the ring finger or the index finger? If you really want to get crazy you can measure both with a ruler, and divide index length by ring length to get a numerical value. Males on average have 0.96 or below, females 1 or higher.
In real life I've observed that this indicator is pretty accurate between cismales and females. There's exceptions, but almost everyone I have seen fit the averages.

Above picture from the washington post.
Please by all means post and comment on the thread, thanks for playing.