hitTwo blind graders agree (D7, rule D16). The auditor agent confirmed it (D11).
Grader A: hit
By 2008-2009 netbooks weighed about 1 kg (2.2 lb) and took about 20% of the portable market; ultra-thin notebooks such as the 2008 MacBook Air shipped. Typical 1999 notebooks weighed 6-7 lb. Smartphones added a much lighter class of portable computer.
Test: At least 20% of new portable units: netbooks peaked at about 20% of the portable computer market, plus thin-and-light notebooks.
Netbook (Wikipedia) (retrieved 2026-09): Netbooks weighed about 1 kg and peaked at about 20% of the portable computer market around 2009.
Grader B: hit
1989 notebooks weighed about 6-7 lb and were about 2 in thick. In 2008-2009 the MacBook Air was 3 lb and 0.75 in, and netbooks weighed about 2 lb.
Test: Device test: ultraportables and netbooks (netbooks near 20% of portable market) at roughly half the weight and thickness of 1989 notebooks.
Wikipedia: MacBook Air (accessed 2026-09-28): 2008 MacBook Air: 19 mm thick, about 1.36 kg (3 lb).
Wikipedia: Netbook (accessed 2026-09-28): Netbooks from late 2007 weighed about 0.9-1 kg; peaked near 20% of portable PC market.
All captured fields
rank
2
kind
decade_prediction
section
Computers
subject
Portable computers lighter, thinner
target year
2009
timing
in
position
Chapter 9, "2009"; item Computers 2 in Kurzweil 2010, p. 12
confidence
high
note
Wording as reproduced by the author in "How My Predictions Are Faring" (2010); book page not given there. Subject label is the essay's own item heading.