Introduction.

Cross Street, Cambridge, Massachusetts, USA. August 26, 2029. 3:00 AM.

• Where is he? – a female voice whispered, slightly annoyed, from under the dark blue hood of a graduation gown with the inscription "MIT Graduate - 2014". – It's time!
• Calm down. He'll be here soon. – replied the tall guy standing next to the girl with confidence, his black curly hair peeking out carelessly from under a "Cambridge Pizza" baseball cap. His pale face was occasionally visible when the dim light from the streetlamps managed to hit his glasses, despite the long visor of the cap.
  On this night, for some reason, the bright signs by the sidewalks were not lit, and the street was darker than usual.
• It's five past three. I'm going to kill him. – the girl hissed after nervously tapping her heel on the asphalt.
• Quiet! There he is! – the guy said, as confidently as before, pointing his finger toward a stranger who had just turned off Massachusetts Avenue.
  The man in the same gown that covered the girl quickened his pace after the guy in the baseball cap waved at him.
• Hi, Penny! – the stranger greeted the girl energetically after shaking his friend's hand.
• Why so long? – the girl snorted in response and immediately added, noticing the judgmental look from both guys – Sorry, hi Leo.
• I was looking for the gown, it was...
• Forget it. Did you bring it? – a cold, dry voice interrupted. Its owner had just emerged from the shadows of the street. He was a tall, thin man of about forty. He wore a black leather jacket, tight dark jeans, and shoes that began to glisten under the streetlights. He was the only one who did not hide his extremely pale face with a strange goatee, which was worn in the early 21st century.
• Hello, Sheldon. Yes, I brought it. I promised, didn't I? – Leo replied, slightly offended, and pulled from his pocket a device resembling cell phones used twenty years ago.
• Excellent. Howard, start the car. Raj is waiting for us at the main entrance. – Professor Sheldon commanded.
  All four got into a car parked nearby with the inscription "TSMO - 2009". A minute later, the car was no longer visible, and the sidewalks were once again illuminated by a dry cleaner's sign that suddenly lit up after the four friends left.