Prague 4, formally the Prague 4 Municipal District (Městská čast Praha 4), is a second-tier municipality in Prague. The administrative district (správní obvod) of the same name consists of municipal …

4-bit computing is the use of computer architectures in which integers and other data units are 4 bits wide. 4-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that …

The BE-4 is used on Blue Origin's New Glenn, a 7.0-meter (23 ft)-diameter two-stage orbital launch vehicle with an optional third stage. The first stage is powered by seven BE-4 engines and is …

Sonic the Hedgehog 4: Episode II received generally average reviews; many critics cited it as an improvement, with praise for its better physics engine, visuals, and multiplayer functionality, but …

The IS-4, also known as the Object 701, was a Soviet heavy tank that started development in 1943 and began production in 1946. Derived from the IS-2 and part of the IS tank family, the IS-4 featured a …

Terpinen-4-ol can be synthesized from terpinolene (1) by photooxidation, reduction of the resulting hydroperoxide (2), and selective hydrogenation of the terminal double bond in 3.

Gran Turismo 4 Prologue (グランツーリスモ4 プロローグ, Guran Tsūrisumo Fō Purorōgu) is a 2003 racing simulation game developed by Polyphony Digital and published by Sony Computer …

The Douglas DC-4 is an American four-engined (piston), propeller-driven airliner developed by the Douglas Aircraft Company. Military versions of the plane, the C-54 and R5D, served during World …

4-Dimethylaminopyridine (DMAP) is a derivative of pyridine with the chemical formula (CH 3) 2 NC 5 H 4 N. This white solid is of interest because it is more basic than pyridine, owing to the resonance …

Sonic the Hedgehog 4: Episode I[a] is a 2010 platform game developed by Dimps, with assistance from Sonic Team, and published by Sega. It is a sequel to Sonic & Knuckles (1994), following Sonic as he …