Why Ethernet minimum packet size is 64 ?

These are two very nice references

http://penchaljammula.blogspot.in/2011/02/minimum-ethernet-frame-or-packet-size.html


http://www.rigacci.org/docs/biblio/online/intro_to_networking/c4642.htm

For Ethernet Base band rule 5-4-3 and for the explanation of Ethernet minimum packet size packet.