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Drake equation
The Drake equation is a probabilistic formula devised in 1961 by American astronomer Frank Drake to estimate the number of communicative extraterrestrial civilizations in the Milky Way. First presented at a meeting on the search for extraterrestrial intelligence (SETI) at the Green Bank Observatory, it organizes astronomical, biological, and technological factors into a single framework. The equation has guided SETI research and provoked debate about its uncertainties and interpretation.
Cursor (computing)
In computing, a cursor is a visual indicator of position and focus on a display, commonly appearing as a text insertion caret or as a pointer that echoes movements of a mouse, touchpad, or stylus. Cursors are defined and controlled by operating systems, terminal control sequences, and web standards, and they also denote control structures in database systems. Their form, behavior, and accessibility can be customized by software and users.
Sweden
Sweden is a Nordic country on the Scandinavian Peninsula, a parliamentary constitutional monarchy with its capital in Stockholm. A member of the European Union since 1995 and NATO since 2024, it has a high‑income, export‑oriented economy and extensive welfare institutions. The country’s landscape ranges from Arctic mountains and forests in the north to lakes and archipelagos in the south, and its population was about 10.6 million in 2025.
Bone marrow transplant
A bone marrow transplant—more precisely, hematopoietic stem cell transplantation—is a medical procedure that replaces or rescues blood‑forming stem cells to reconstitute hematopoiesis and immunity. It is used to treat malignant and non‑malignant disorders, including leukemias, lymphomas, myelodysplastic syndromes, aplastic anemia, thalassemia, and sickle cell disease. Modern practice encompasses autologous, allogeneic, and syngeneic approaches with grafts sourced from peripheral blood, marrow, or umbilical cord blood, with outcomes continually improving through advances in conditioning, donor selection, and graft‑versus‑host disease prophylaxis.
Aircraft design
Aircraft design is the engineering discipline and industrial process of conceiving, sizing, analyzing, certifying, and producing flying vehicles to meet specified mission, performance, safety, environmental, and economic requirements. It integrates aerodynamics, structures and materials, propulsion, stability and control, systems engineering, and certification within a staged process—conceptual, preliminary, and detailed design—supported by testing and simulation.
Big Bang
The Big Bang is the prevailing cosmological model describing the origin and evolution of the observable universe from an early hot, dense state to its present expansion. Key empirical pillars include the Hubble–Lemaître law of cosmic expansion, relic cosmic microwave background radiation, primordial light-element abundances, and the growth of large‑scale structure.
BICEP2
BICEP2 was a ground-based cosmic microwave background polarization experiment at the Amundsen–Scott South Pole Station designed to measure degree-scale B-mode polarization as a probe of primordial gravitational waves from cosmic inflation. In March 2014 the collaboration reported a high-significance B-mode signal, later shown—through joint analyses with Planck data—to be dominated by polarized Galactic dust, establishing upper limits on the tensor-to-scalar ratio rather than a detection.
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Blurryface
Blurryface is the fourth studio album by American duo Twenty One Pilots, released on May 17, 2015 by Fueled by Ramen. Blending alternative rock, electropop, hip hop, and reggae, it produced the hit singles “Stressed Out” and “Ride,” and became a long-running commercial success, debuting at No. 1 on the Billboard 200. In 2018 it became the first album in the digital era with every track certified at least Gold by the RIAA.
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