SAT Reading and Writing - Comprehensive Study Guide for Expression of Ideas

Biological Sciences, Ecology, and Primatology

• Avian Structural Mechanics: A research team led by Yashraj Bhosale investigated why bird nests are uniquely flexible yet cohesive as engineered structures. Using laboratory models of flexible sticks, they discovered that as pressure is applied to the nest structure, the number of contact points between the sticks increases, which directly causes the structure to become stiffer.
• Environmental DNA (eDNA): Organisms release cellular material into environments through shedding (hair or skin). Geneticist Sara Oyler-McCance used water samples from the Florida Everglades to detect invasive constrictor snakes via eDNA analysis. Her study found a $91\%$ probability of detecting Burmese python DNA in specific locations, proving eDNA as a viable tool for observing difficult-to-track species.
• Orchidaceae Diversity in Mexico: Arelee Estefana Muoz-Hern
  ndez led a year-long study in the temperate forests of Oaxaca, Mexico. By collecting orchids monthly, her team identified $74$ distinct species, addressing a gap in research regarding orchid diversity in temperate versus tropical environments.
• Gray Wolf Populations in Yellowstone: Since their reintroduction in $1995$, gray wolves in Yellowstone National Park have stabilized at approximately $100$ individuals. This total is considered the park's carrying capacity, defined as the maximum number of a species that an environment's resources can sustain over time.
• Wild Macaque Communication: Researchers Adwait Deshpande, Shreejata Gupta, and Anindya Sinha studied macaques in India's Bandipur National Park ($2018$). They found macaques intentionally gesture and call out more frequently to humans holding food than to empty-handed humans, suggesting persuasive communication.
• Olfactory System Methods: Neuroscientists Krishnan Padmanabhan and Zhen Chen used mathematical models to study the piriform cortex. They identified fibers that allow the brain to toggle between two methods: capturing olfactory information at a single moment or tracking changes in odor information over time.
• Floating Treatment Wetlands (FTWs): A $2023$ study by Jazmin Locke-Rodriguez in Florida tested FTWs (artificial plant platforms) for water remediation. Marigolds grown on these platforms removed $52\%$ more total phosphorus than control groups and produced $65$ market-quality blooms per square meter.
• Deep-Sea Fish Chemistry: The chemical trimethylamine N-oxide protects deep-sea fish from hydrostatic pressure by strengthening the bonds between water molecules in the fish’s body, preventing pressure-related damage.
• Gal
  pagos Bird Conservation:
  • Certhidea olivacea: A perching bird on the island of Pinzn facing a high risk of extinction.
  • Creagrus furcatus: A seabird on the island of Darwin facing little risk of extinction.
• Elephant Communication: Female elephants use infrasonic calls (below the range of human hearing) to locate calves after dark; these sounds travel several miles.

Physical Sciences, Chemistry, and Engineering

• The Haber-Bosch Process ($1910$): Invented by chemists Fritz Haber and Carl Bosch, this industrial process manufactures ammonia ($\text{NH}_3$) by combining nitrogen ($N_2$) from the air with hydrogen ($H_2$). The reaction requires an iron catalyst, high temperatures, and high pressures. Ammonia is primarily used in the production of fertilizers.
• Platinum Catalysts: Platinum is rare and expensive. Standard catalysts require large amounts to be effective. However, Jianbo Tang and colleagues developed a catalyst combining platinum with liquid gallium that requires only trace amounts ($0.0001\%$ of the atoms) while maintaining high effectiveness.
• Digital Light Synthesis (DLS): An additive manufacturing technique using light to cure liquid resin into $3D$ objects in four steps:
  • Step 1: Ultraviolet (UV) light images project into liquid resin to form the first layer.
  • Step 2: The object is raised, creating a "dead zone" for resin and oxygen flow.
  • Step 3: UV light passes through the dead zone to cure additional layers.
  • Step 4: The completed object is baked in an oven to finish curing.
• Molecular Symmetry: Achiral molecules are symmetrical; flipping them produces an identical molecule. Chiral molecules, when flipped, produce a structurally inverted molecule (like an inside-out glove).
• Stellar Surface Temperatures: In $1999$, Todd Henry mapped stars within $10\,\text{parsecs}$ ($\approx 200 \times 10^{12}\,\text{miles}$) of the Sun:
  • Sun: G star, $9,800^{\circ}\text{F}$.
  • K and M stars (327\/357): Cooler than the Sun ($<8,900^{\circ}\text{F}$).
  • A and F stars (11\/357): Hotter than the Sun ($>10,300^{\circ}\text{F}$).
• Torsional Heating: Objects heat up when twisted (torsion). A $2019$ study found:
  • $3\,\text{mm}$ thermoplastic polyurethane (TPU) fiber: Surface temperature increased by $6^{\circ}\text{C}$.
  • $4\,\text{mm}$ styrene-ethylene-butylene-styrene (SEBS) rubber fiber: Surface temperature increased by $3.5^{\circ}\text{C}$.
• Nuclear Fusion: Involves two atoms colliding to form a heavier atom, releasing energy. While theorized to meet clean energy needs, no net energy gain was recorded in a laboratory until December $2022$.
• LIGO Physics Study: The Laser Interferometer Gravitational Wave Observatory ($2002$) uses two massive interferometers thousands of miles apart to detect ripples in space-time. The first wave was detected in $2015$.

Earth Sciences and Astronomy

• Volcanology:
  • Hverfjall (Iceland): A cinder cone volcano.
  • Toliman (Guatemala): A composite volcano.
  • Icelandic Magma: Researchers Kaiqing Yuan and Barbara Romanowicz suggest magma for Iceland’s $30+$ volcano systems comes from nearly $3,000\,\text{km}$ deep, unlike the usual $<15\,\text{km}$ depth for most volcanoes.
• Aeolian Landforms: Formations created by wind erosion, transportation, or deposition. An example is the mushroom rock, where the wind erodes the base faster than the top.
• Planetary Science:
  • Ceres: Dwarf planet containing bright regions with high levels of sodium carbonate ($\text{Na}_2\text{CO}_3$).
  • Gas Giants: Thermal inversions (upper atmosphere warmer than lower) in gas giants are often linked to the presence of heat-absorbing metals in the upper atmosphere.
  • Exoplanets: Phobetor (orbits Lich, $0.01$ Jupiter masses) and Mastika (orbits Gumala, $0.92$ Jupiter masses).
  • Sunspots: Variable dark spots on the Sun (e.g., $180$ in November $2001$ vs. $2$ in December $2008$).
• Quenched Galaxies: Galaxies that have undergone "quenching" (loss of star-forming gas) and moved into the poststarburst phase where they no longer form stars.
• Kelp Highway Hypothesis: Archaeologist Jon Erlandson proposes humans arrived in the Americas via a coastal route from northeast Asia, utilizing marine resources (seaweeds, fish, birds) in islands and coastlines now largely submerged.

Art, Literature, and Media

• Sam Maloof ($1916–2009$): American woodworker and son of Lebanese immigrants. He received a MacArthur "genius grant" in $1985$. A walnut rocking chair of his, featuring sleek contoured armrests and seven spindle-like slats, resides in the Museum of Fine Arts, Boston.
• Simphiwe Ndzube: South African artist whose $2021$ exhibition Oracles of the Pink Universe included the painting Assertion of Will. This work features figures with clothing made of fabric pieces stitched directly to the canvas.
• Textiles and Muslins:
  • Dhaka Muslin: Handmade in Bangladesh, extremely fine weave, used for luxury clothing.
  • Sheeting Muslin: Machine-made, coarse weave, used for upholstery and theater backdrops.
• Light Sculptures by Grimanesa Amoros:
  • Uros Island: Multicolored LED domes ($335\,\text{cubic feet}$).
  • Fortuna: Blue and white LED tubes ($19,950\,\text{cubic feet}$).
• Influential Literature and Legislation:
  • The Interesting Narrative of the Life of Olaudah Equiano ($1789$): Autobiography that aided the Slave Trade Act of $1807$.
  • The Jungle ($1906$): Upton Sinclair’s fictional work that led to the Pure Food and Drug Act of $1906$.
• Leporellos by Etel Adnan: Accordion-style folded books that stand in a zigzag shape. Her work December from My Window ($1993$) is an ink and watercolor panoramic landscape.
• Beatbox Flute: American flutist Annie Wu is famous for a $2011$ YouTube video ($2+\,\text{million views}$) where she performs Greg Pattillo’s Three Beats for Beatbox Flute.

History, Archaeology, and Social Studies

• Tyrannosaurus Specimens: "Sue" is located at the Field Museum of Natural History in Chicago, Illinois. "Big Mike" is housed at the Museum of the Rockies in Bozeman, Montana.
• The House of Wisdom: Located in Baghdad, Iraq ($8^{\text{th}}$ century), it aimed to preserve world knowledge. Scholars translated Greek (Aristotle) and Indian (Aryabhata) texts into Arabic using Chinese papermaking technology.
• Viking Presence in the Azores: While historians believed Portuguese mariners reached the Azores in the $15^{\text{th}}$ century, a $2015$ genetic study of house mice suggests Vikings may have arrived from Scandinavia in the $9^{\text{th}}$ century.
• Muckrakers: Progressive Era journalists ($1897–1920$) exposing corruption. Ida Tarbell investigated Standard Oil ($1904$) by reviewing thousands of internal documents and interviewing officials.
• S
  mi Rights and the Alta Conflict: In $1978$, S
  mi activists in Norway protested a dam on the Alta River. While the dam was built, the conflict led to the $2005$ legal protections for S
  mi lands and resources.
• Hart-Celler Act ($1965$): Abolished the US national-origins quota system that had been in place since the early $1960\text{s}$, which previously favored northern European immigrants (specifically from Great Britain, Ireland, and Germany).
• March on Washington ($1963$): Anna Hedgeman (political adviser) worked behind the scenes to ensure female representation; Daisy Bates (journalist) was the only woman to speak publicly at the march.
• National Congress of American Indians (NCAI): Founded in $1944$ by representatives of $50$ tribes to protect sovereignty. Their advocacy was crucial to passing the Indian Self-Determination and Education Assistance Act in $1975$.

Questions & Discussion

• Q: Which choice most effectively presents the primary aim of Yashraj Bhosale’s bird nest research?
  • A: Bhosale’s team wanted to better understand the mechanics behind bird nests’ uniquely flexible yet cohesive structural properties.
• Q: What is the significance of the 1990 discovery of the M. carinatus phalanx in Lesotho regarding Robert Plot?
  • A: Evidence that Khoesan and Basotho peoples may have found the phalanx as long ago as $1100\,\text{CE}$ suggests that Plot (who described bones in $1676$) may not have been the first to discover dinosaur remains.
• Q: How did the Siletz Indians' stories support the discovery of the 1697 Spanish cargo ship?
  • A: Siletz stories describe blocks of beeswax (carried by the ship) washing ashore after the ship was lost.
• Q: What was the result of the Switzerland voting age change on March 3, 1991?
  • A: The age was lowered from $20$ to $18$, providing many more citizens the opportunity to participate in the political process.