Source: Image of light, Public Domain, http://tinyurl.com/p4pfjr7; Image question marks, Public Domain, http://tinyurl.com/kzeorkr; Skype logo, Public Domain, http://tinyurl.com/mh3smrf ; Image Digital Bloom’s, Creative Commons, http://tinyurl.com/mtbount; Image checklist, Public Domain, http://tinyurl.com/kecnclw ; Image silhouettes, Public Domain, http://tinyurl.com/mprab43; Image PP, Public Domain, http://tinyurl.com/osedjv5 ; Image Google, Public Domain, http://tinyurl.com/mmwldgs ; Image ??, Public Domain, http://tinyurl.com/nd5fcd9
