5,533 followers
RT @ConcernedMom9: @kimberlyarchie Heavier/bigger with time -> "Helmets of 2010s weigh 1.95 ± 0.2 kg and are 2.7 times heavier than 1970s d…
RT @ConcernedMom9: @kimberlyarchie Heavier/bigger with time -> "Helmets of 2010s weigh 1.95 ± 0.2 kg and are 2.7 times heavier than 1970s d…
@kimberlyarchie Heavier/bigger with time -> "Helmets of 2010s weigh 1.95 ± 0.2 kg and are 2.7 times heavier than 1970s designs. They are also 4.3 cm longer, 7.6 cm higher, and 4.9 cm wider." https://t.co/3yIGo3BhfC