Negative interest rates

Thanks to tutor2u for this
http://www.tutor2u.net/economics/blog/negative-interest-rates-defy-gravity?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Fri%2010th%20June%202016&utm_content=Economics%20daily%20digest%20Fri%2010th%20June%202016+CID_72c5105184bad3c9e0c39a4cf8ce781d&utm_source=CampMonitor&utm_term=Negative%20interest%20rates%20defy%20gravity%20Here%20is%20a%20cartoon%20explainer%20on%20why%20official%20interest%20rates%20are%20now%20negative%20in%20a%20quarter%20of%20the%20global%20economy%20without%20causing%20so%20far%20massive%20cash%20withdrawals