Skyscraper shorter than the W350 Project despite having 10 more stories. Wooden skyscrapers are estimated to be around a quarter of the weight of an equivalent reinforced-concrete structure as well as reducing the building carbon footprint by 60–75%. Buildings have been designed using cross-laminated timber (CLT) which gives a higher rigidity and strength to wooden structures. CLT panels are prefabricated and can therefore speed up building time. Skyscraper A skyscraper is a continuously habitable high-rise building that has over 40 floors and is taller than approximately . Historically, the term first referred to buildings with 10 to 20 floors in the
CD-ROM encyclopedia CD-ROM encyclopedia A CD-ROM encyclopedia is an encyclopedia delivered as reference software on a CD-ROM disc for use on a personal computer. This was the usual way computer users accessed encyclopedic knowledge from early 1990s until the late 1990s. Later DVD discs replaced CD-ROMs and from mid-2000s internet encyclopedias became dominant and replaced disc-based software encyclopedias. Some examples of CD-ROM encyclopedia are Encarta, Grolier Multimedia Encyclopedia, and Britannica. CD-ROM encyclopedias were usually a MacOS or Microsoft Windows (3.0, 3.1 or 95/98) application on a CD-ROM disc. The user would execute the encyclopedia's software program to see a menu that allowed