Two distinct populations of dark comets delineated by orbits and sizes.

Small bodies are capable of delivering essential prerequisites for the development of life, such as volatiles and organics, to the terrestrial planets. For example, empirical evidence suggests that water was delivered to the Earth by hydrated planetesimals from distant regions of the Solar System. Recently, several morphologically inactive near-Earth objects were reported to experience significant nongravitational accelerations inconsistent with radiation-based effects, and possibly explained by volatile-driven outgassing.

Acceleration of 1I/'Oumuamua from radiolytically produced H in HO ice.

In 2017, 1I/'Oumuamua was identified as the first known interstellar object in the Solar System. Although typical cometary activity tracers were not detected, 'Oumuamua showed a notable non-gravitational acceleration. So far, there has been no explanation that can reconcile these constraints.

Long-term outcomes of the Nexgen posterior stabilized knee: minimum 15 year follow-safe and effective.

Purpose: Studying long-term survivorship and functional outcomes for specific prostheses is critical for elucidating areas in need of design improvement. This study reports the long-term of the NexGen Posterior Stabilized (PS) Total Knee implant (TKA) (Zimmer Biomet, Warsaw IN) Performed by a single surgeon.

Methods: Data from patients treated with the NexGen PS TKA between January 2003 and December 2005 with a minimal follow-up of 15 years was collected from a prospectively collected database.

Treating Heel Pain in Adults: A Randomized Controlled Trial of Hard vs Modified Soft Custom Orthotics and Heel Pads.

Objectives: This study compared the effectiveness of soft vs hard orthotics in treating heel pain and plantar fasciitis in adults. It also compared the level of function after orthotic use, cost, and number of visits for orthotics and explored whether age was a factor in orthotic effectiveness.

Design: Randomized controlled trial.