• First let's check if Biden has Hitchhiker's thumbs - link
• Pretty Bent
• Very Bent
• Very bent

• So yes Biden does appear to have Hitch hikers thumbs so it would not be improbable for him to bend his thumb backward at the joint especially when he is applying pressure with his other hand.

• This is one explanation, there could be others. But because it can be explained with fairly normal human anatomy and with historical references, it's not correct to ignore this explanation in favor of a much more unlikely and complicated explanation such as a silicone hand, which is both malleable, hyper-realistic, and posable for some even more complicated plot.

Lastly, it would be nice to get the original PBS video for clarity's sake.

• First let's check if Biden has Hitchhiker's thumbs - link
• Pretty Bent
• Very Bent
• Very bent

• So yes Biden does appear to have Hitch hikers thumbs so it would not be improbable for him to bend his thumb backward at the joint especially when he is applying pressure with his other hand.

• This is one explanation, there could be others. But because it can be explained with fairly normal human anatomy and with historical references, it's not correct to ignore this explanation in favor of a much more unlikely and complicated explanation suck as a silicone hand, which is both malleable, hyper-realistic, and posable for some even more complicated plot.

Lastly, it would be nice to get the original PBS video for clarity's sake.