The document summarizes four people that the author followed on Twitter: 1) Tom Altepeter, who tweets about topics concerning humanity and quotes Nelson Mandela. He is concerned with racism and how love can unite the world. 2) Aviva Dunsiger, a teacher who posts pictures of her students' projects and activities. She aims to make learning hands-on and motivate her students to succeed. 3) PernilleRipp, a teacher, author and mother. She is passionate about reading and hands-on learning. She engages students in exciting projects and technology. 4) Chris Wejr, a principal who tweets about education, leadership and visual learning. He believes school should