That's pretty impressive. Given the size and importance of the mirrors, I wondered how they actually clean them. Came across this:
https://www.youtube.com/watch?v=CkV8RRRu7gE
I cannot recall in which book I read this, but there was a similar experiment completed before. (Possibly an NLP book)
A University professor asked students to solve an anagram. After they were done, they had to walk into the professor's office to tell him the word. In his office he'd be pretending to have a conversation with a visitor.
The words the the students had to solve were either positive, negative or neutral.
The result was that students that had a negative word, were far more likely to interrupt the professor's conversation with the visitor more quickly than students that had a positive or neutral word.
After the students told the professor the word, he asked the students if they believed the word had an impact on their emotion. All of the students said no, but the data showed the negative words had an impact.
But I'm a biased Ninefold employee... There's a one month free trial, so give it a try and see how you go. If you have any issues/queries - our support staff will be more than happy to help.
At the bottom of the article they have "methodology" link, which explains how the test was performed and how you can replicate the tests yourself.
https://ninefold.com/performance-method/
I'm very impressed with Amazon's scale and their ability to produce such low prices. Whilst many SaaS vendors (and even traditional brick and mortar business) seemingly keep on increasing prices because of "inflationary" pressures and whatnot... Amazon just keeps on showing - the consumers are being taken for a ride by the rest of the businesses out there.
Just wait until Google Glass takes off, cloud storage becomes cheaper, wifi/mobile networks become faster... And those Russian dash cam/fail videos will hit a new high in no time.