Harris Street will be bubbling up and frothing over from August 21 to 30 for the fourth annual Ultimo Science Festival held as part of National Science Week.

There'll be day and night events, school sessions, family and kids events, pub events, talks and forums for everyone. It's not just for geeks, scientists and students (though they'll be there), it's for everybody!

National Science Week is Australia's largest festival with around 600 events held around the country, around 700,000 participants.

Visit Ultimosciencefestival.com or Scienceweek.info.au