Luke: I look somewhat askance at this reference:
http://indo-european.info/dictionary-translator/ . I put in the numbers from one to ten and got what I might expect from some random PIE language. I don't have all the characters in my caracter set but they were something like: oinos dwou trejes q∂twres penqe seks septm oktōu newn dekm. Just what does "translation" mean. I was looking for the root PIE words for our English counting numbers. I got roots from some source resembling English for all but four,five and ten. Q∂twres, Penqe and dekm are apparently roots for four, five and ten in, for example, Latin, Farsi and Hindi. Of course we see quadrant, pentagon, and decimal in English that come from this man's set of PIE words. Latin is Unus duo tres quattuor, quinque, sex, septem, octo, novem, decem. I can count in Farsi but I cannot write in Arabic letters so I cannot accurately write the numbers using Roman letters, but doing the best i can, five is pangh and ten is dach in Farsi, making it close to Latin. Five seems to be the number at greatest variability in PIE languages.
An almost uiversal PIE word is paw for any kind of foot. of course we use it for cat and dog feet. Sure enough the referenced site gives me his PIE's pods for foot.
Probably no one is following me on this so I will quit the examples. What I don't know is how this man decided these were the PIE roots. Why do Germanic languages say something like foot? Is there a PIE root for the word foot.
Unless someone of recognized authority puts his/her imprimater on this reference, I will be sceptical. If the Good Doctor gave his opinion, I would go with him.
It is dark at night, but the Sun will come up and then we can see.