Advertising will be able to address a single person

Ray Kurzweil : futurist
Advertisements will utilize a new technology whereby two ultrasonic beams can be targeted to intersect at a specific point, delivering a localized sound message that only a single person can hear.

Kurzweil, Ray. 2005. The singularity is near: when humans transcend biology. New York: Viking.

Fatal error: Uncaught exception 'ErrorException' with message 'file_put_contents(/var/www/foresight/data/www/ failed to open stream: Permission denied' in /var/www/foresight/data/www/ Stack trace: #0 [internal function]: Kohana_Core::error_handler(2, 'file_put_conten...', '/var/www/foresi...', 91, Array) #1 /var/www/foresight/data/www/ file_put_contents('/var/www/foresi...', '\n2020-02-21 22:...', 8) #2 /var/www/foresight/data/www/ Kohana_Log_File->write(Array) #3 /var/www/foresight/data/www/ Kohana_Log->write() #4 [internal function]: Kohana_Session->write() #5 {main} thrown in /var/www/foresight/data/www/ on line 91