David Crosthwait,Jr.

Crosthwait invented something that we all are glad to have. We use this system in the summer and the winter, or just when ever we need it. He invented the HVAC. Which is the heating ventilation and air conditioning. It all came about when he studied heat transfer and steam transport, as he went into a deep concentration study he put all of his thoughts together and he created the HVAC. If he was still living and you had to write a thank you letter what would you say to him, because he is a big help to us all today.

What would you do. How do you feel.

How would you feel if you did something so great and someone took credit for it. Many african american who invented things that we use every day did not receive credit for it. Garrett A. Morgan invented the tarffic light and he don't always receive credit for it all the time. How would you feel if this happen to you.