Mechanical pulping yields almost a tonne of pulp per tonne of dry wood used, which is why mechanical pulps are sometimes referred to as "high yield" pulps. With almost twice the yield as chemical pulping, mechanical pulps is often cheaper. Mass-market paperback books and newspapers tend to use mechanical papers. Book publishers tend to use acid-free paper, made from fully bleached chemical pulps for hardback and trade paperback books.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What type of pumps are sometimes called low yield pumps?
Ah, so.. unanswerable

In the early part of the 20th century, San Diego hosted two World's Fairs: the Panama-California Exposition in 1915 and the California Pacific International Exposition in 1935. Both expositions were held in Balboa Park, and many of the Spanish/Baroque-style buildings that were built for those expositions remain to this day as central features of the park. The buildings were intended to be temporary structures, but most remained in continuous use until they progressively fell into disrepair. Most were eventually rebuilt, using castings of the original facades to retain the architectural style. The menagerie of exotic animals featured at the 1915 exposition provided the basis for the San Diego Zoo. During the 1950s there was a citywide festival called Fiesta del Pacifico highlighting the area's Spanish and Mexican past. In the 2010s there was a proposal for a large-scale celebration of the 100th anniversary of Balboa Park, but the plans were abandoned when the organization tasked with putting on the celebration went out of business.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What festival was celebrated in the 1960s in recognition of the city's Mexican and Spanish past?
Ah, so.. unanswerable

Parts of what is now Rajasthan were part of the Indus Valley Civilization. Kalibangan, in Hanumangarh district, was a major provincial capital of the Indus Valley Civilization,. It is believed that Western Kshatrapas (40535 BC) were Saka rulers of the western part of India (Saurashtra and Malwa: modern Gujarat, Southern Sindh, Maharashtra, Rajasthan). They were successors to the Indo-Scythians and were contemporaneous with the Kushans, who ruled the northern part of the Indian subcontinent. The Indo-Scythians invaded the area of Ujjain and established the Saka era (with their calendar), marking the beginning of the long-lived Saka Western Satraps state. Matsya, a state of the Vedic civilisation of India, is said to roughly corresponded to the former state of Jaipur in Rajasthan and included the whole of Alwar with portions of Bharatpur. The capital of Matsya was at Viratanagar (modern Bairat), which is said to have been named after its founder king Virata.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The Kushans ruled what part of the Indian subcontinent?
Ah, so..
the northern part