I missed yesterday so I'm doubling up. Power outages everywhere.
The banjo originated in Africa and up until the 1800s was considered an instrument only played by blacks.
Jack Johnson (1878 – 1946), the first African–American heavyweight champion, patented a wrench in 1922.
Engineer David Crosthwait, Jr.
held 39 U.S. patents and 80 international patents pertaining to
heating, refrigeration, temperature regulation and pump processes.
No comments:
Post a Comment