Hawking appears in Seattle on June 16, 2012, while he was taking part in the Seattle Science Festival Luminaries Series.

Hawking appears in Seattle on June 16, 2012, while he was taking part in the Seattle Science Festival Luminaries Series.

Hawking appears in Seattle on June 16, 2012, while he was taking part in the Seattle Science Festival Luminaries Series.

Hawking appears in Seattle on June 16, 2012, while he was taking part in the Seattle Science Festival Luminaries Series.