Demos are down secondary to “degradation” of the aws instance per email I just got(should be able to rebuild another instance in the very near future):
Dear Amazon EC2 Customer,
We have important news about your account (AWS Account ID: ****). EC2 has detected degradation of the underlying hardware hosting your Amazon EC2 instance (instance-ID: ***) in the us-west-2 region. Due to this degradation, your instance could already be unreachable. After 2017-10-09 13:00 UTC your instance, which has an EBS volume as the root device, will be stopped.