https://www.forbes.com/sites/brucelee/2019/05/24/there-is-a-helium-shortage-what-you-need-to-know/#12e0b33c70b3
https://spectrumnews1.com/ca/la-east/news/2019/05/21/party-stores-trying-to-stay-afloat-during-helium-shortage
https://www.smithsonianmag.com/smart-news/future-helium-air-180972220/
https://www.wect.com/2019/05/22/global-helium-shortage-impacts-local-small-business/