Comment on

• High-precision comparison of the antiproton-to-proton charge-to-mass ratio.

  Ulmer S, Smorra C, Mooser A, Franke K, Nagahama H, Schneider G, Higuchi T, Van Gorp S, Blaum K, Matsuda Y, Quint W, Walz J, Yamazaki Y. Ulmer S, et al. Nature. 2015 Aug 13;524(7564):196-9. doi: 10.1038/nature14861. Nature. 2015. PMID: 26268189
• Observation of the 1S-2S transition in trapped antihydrogen.

  Ahmadi M, Alves BX, Baker CJ, Bertsche W, Butler E, Capra A, Carruth C, Cesar CL, Charlton M, Cohen S, Collister R, Eriksson S, Evans A, Evetts N, Fajans J, Friesen T, Fujiwara MC, Gill DR, Gutierrez A, Hangst JS, Hardy WN, Hayden ME, Isaac CA, Ishida A, Johnson MA, Jones SA, Jonsell S, Kurchaninov L, Madsen N, Mathers M, Maxwell D, McKenna JT, Menary S, Michan JM, Momose T, Munich JJ, Nolan P, Olchanski K, Olin A, Pusa P, Rasmussen CØ, Robicheaux F, Sacramento RL, Sameed M, Sarid E, Silveira DM, Stracka S, Stutter G, So C, Tharp TD, Thompson JE, Thompson RI, van der Werf DP, Wurtele JS. Ahmadi M, et al. Nature. 2017 Jan 26;541(7638):506-510. doi: 10.1038/nature21040. Epub 2016 Dec 19. Nature. 2017. PMID: 28005057