Wikipedia:Today's featured article

Guallatiri is a stratovolcano in Chile that is 6,060–6,071 m (19,880–19,918 ft) high. It is located southwest of, or possibly within, the Nevados de Quimsachata volcanic group. The summit, surrounded by numerous fumaroles, may be a lava dome or volcanic plug, while the lower flanks of the volcano are covered by lava flows and lava domes. The volcano's eruptions have produced mostly dacite along with andesite and rhyolite. Past glaciation has left moraines on Guallatiri. A large eruption took place approximately 2,600 years ago. Guallatiri has been active since prehistoric times, with the latest known eruption in 1960. Fumarolic and seismic activity is ongoing and has resulted in the deposition of sulfur and other minerals on the volcano. It is covered by an ice cap above 5,500–5,800 m (18,000–19,000 ft) elevation that has retreated and broken up into separate ice bodies. Part of Lauca National Park, Guallatiri is monitored by the Chilean National Geology and Mining Service. (Full article...)

Original route of the Circle Line (grey) following Nicoll Highway (pink), and the realigned route (orange)

The Nicoll Highway collapse occurred in Singapore on 20 April 2004 when a Mass Rapid Transit tunnel construction site caved in near the highway next to the Merdeka Bridge. Four workers were killed and three were injured, delaying the construction of the Circle Line. The collapse was caused by a poorly designed strut-waler support system, a lack of monitoring and proper management of data caused by human error, and organisational failures of the construction contractors and the Land Transport Authority. Following the incident, the collapsed site was refilled, and the highway was reinstated and reopened to traffic on 4 December 2004. The authorities revised their construction safety measures to be above industry standards. The Circle Line tunnels were realigned (map pictured), with Nicoll Highway station rebuilt underneath Republic Avenue, to the south of the original site. The station and tunnels opened on 17 April 2010, three years later than planned. (Full article...)

Steve Davis in 2012

The 1984 World Snooker Championship was a ranking professional snooker tournament that took place between 21 April and 7 May at the Crucible Theatre in Sheffield, England. The event was organised by the World Professional Billiards and Snooker Association, and was the eighth consecutive World Snooker Championship to be held at the Crucible since the 1977 event. It featured 94 participants, of which 78 players competed in a qualifying event held at the Redwood Lodge in Bristol. The defending champion was English player Steve Davis (pictured), who had won the title twice previously. He met Jimmy White in the final, which was played as a best-of-35-frames match. Davis won 18–16, becoming the first player to retain the title at the Crucible. Rex Williams secured the championship's highest break, scoring a 138 in the 12th frame of his first-round loss to White. Eight century breaks were made during the competition, the fewest since the 1978 event. (Full article...)