# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2019-07-17 18:50:55 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1151564956778848256) RT @grobmVR: @keefmoon @AndrewProjDent We did studies in the 90s on brass implants... I would add time frame X10 to your statement.