http://www.biography.com/people/daniel-hale-williams-9532269#completes-first-open-heart-surgery
http://www.drkarenwinkfield.com/uploads/1/6/1/4/16142658/851441_orig.jpg
http://www.discoveriesinmedicine.com/images/mdis_0000_0003_0_img0108.jpg
http://myhero.com/images/guest/g243/hero104184/daniel-hale-williams1.jpg
http://cdn.quotesgram.com/img/8/98/1928779370-AW_6008_1251.jpg
http://www.yorkblog.com/cannonball/files/2014/11/Henry-Palmer.jpg
https://www.britannica.com/biography/Daniel-Hale-Williams
http://factfile.org/10-facts-about-daniel-hale-williams
https://www.youtube.com/watch?v=gXmd3ItZM1E&list=PLPXA6Gaxkpv4PP6ldE2M2_6UmkKGkbvsE
http://www.drkarenwinkfield.com/uploads/1/6/1/4/16142658/851441_orig.jpg
http://www.discoveriesinmedicine.com/images/mdis_0000_0003_0_img0108.jpg
http://myhero.com/images/guest/g243/hero104184/daniel-hale-williams1.jpg
http://cdn.quotesgram.com/img/8/98/1928779370-AW_6008_1251.jpg
http://www.yorkblog.com/cannonball/files/2014/11/Henry-Palmer.jpg
https://www.britannica.com/biography/Daniel-Hale-Williams
http://factfile.org/10-facts-about-daniel-hale-williams
https://www.youtube.com/watch?v=gXmd3ItZM1E&list=PLPXA6Gaxkpv4PP6ldE2M2_6UmkKGkbvsE