| 401. | Yukawa theory | Wikipedia audio article | 3 | |
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| 402. | K. Shankar Pillai | Wikipedia audio article | 3 | |
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| 403. | Shindengen Electric Manufacturing | Wikipedia audio article | 3 | |
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| 404. | PTS (amphibious vehicle) | Wikipedia audio article | 3 | |
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| 405. | Saint Pudens | Wikipedia audio article | 3 | |
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| 406. | Nagaland | Wikipedia audio article | 3 | |
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| 407. | Energy policy of India | Wikipedia audio article | 3 | |
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| 408. | Kinetica (game engine) | Wikipedia audio article | 3 | |
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| 409. | Sanskrit language | Wikipedia audio article | 3 | |
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| 410. | Ethnopoetics | Wikipedia audio article | 3 | |
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| 411. | Relics associated with Jesus | Wikipedia audio article | 3 | |
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| 412. | Goykanadi | Wikipedia audio article | 3 | |
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| 413. | L-type calcium channel | Wikipedia audio article | 3 | |
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| 414. | Α-bungarotoxin | Wikipedia audio article | 3 | |
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| 415. | Assyrian genocide | Wikipedia audio article | 3 | |
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| 416. | Harold Stassen | Wikipedia audio article | 3 | |
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| 417. | Sister Sonic | Wikipedia audio article | 3 | |
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| 418. | Leyland Titan (front-engined double-decker) | Wikipedia audio article | 3 | |
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| 419. | Manchester | Wikipedia audio article | 3 | |
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| 420. | Flying machine (The War of the Worlds) | Wikipedia audio article | 3 | | The War of the Worlds
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| 421. | Bombing of Wuppertal in World War II | Wikipedia audio article | 3 | |
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| 422. | Pierre Guillaume Frédéric le Play | Wikipedia audio article | 3 | |
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| 423. | Mephenesin | Wikipedia audio article | 3 | |
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| 424. | Iran Air Flight 655 | Wikipedia audio article | 3 | |
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| 425. | Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter | Wikiped ... | 3 | |
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| 426. | European maritime exploration of Australia | Wikipedia audio article | 3 | |
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| 427. | Goulash Communism | Wikipedia audio article | 3 | |
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| 428. | Forced labor in Germany during World War II | Wikipedia audio article | 3 | |
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| 429. | Greenville, Virginia | Wikipedia audio article | 3 | |
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| 430. | Dr. A. Q. Khan Institute of Computer Sciences and Information Technology | Wikipedia audio article | 3 | Vlog |
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| 431. | Megalopolis, Greece | Wikipedia audio article | 3 | |
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| 432. | Ukrainian alphabet | Wikipedia audio article | 3 | Let's Play |
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| 433. | Maurice Merleau-Ponty | Wikipedia audio article | 3 | |
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| 434. | Insect | Wikipedia audio article | 3 | |
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| 435. | Mississippi Delta | Wikipedia audio article | 3 | |
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| 436. | Sharia | Wikipedia audio article | 3 | |
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| 437. | Principality of Achaea | Wikipedia audio article | 3 | |
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| 438. | Computer algebra | Wikipedia audio article | 3 | |
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| 439. | Christianity in the 16th century | Wikipedia audio article | 3 | |
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| 440. | Vatican Advanced Technology Telescope | Wikipedia audio article | 3 | Vlog |
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| 441. | Puri | Wikipedia audio article | 3 | |
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| 442. | Huayan school | Wikipedia audio article | Wikipedia audio article | 3 | |
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| 443. | Barberton chicken | Wikipedia audio article | 3 | |
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| 444. | National Highway 119 (India) | Wikipedia audio article | 3 | |
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| 445. | Elvin A. Kabat | Wikipedia audio article | 3 | |
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| 446. | List of the largest companies of China | Wikipedia audio article | 3 | |
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| 447. | Trachemys gaigeae | Wikipedia audio article | 3 | |
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| 448. | Afrikan Spir | Wikipedia audio article | 3 | |
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| 449. | Operation Deny Flight | Wikipedia audio article | 3 | |
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| 450. | Wagner Motorcycle Company | Wikipedia audio article | 3 | |
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| 451. | Atlas LV-3B | Wikipedia audio article | 3 | |
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| 452. | Spanish Legion | Wikipedia audio article | 3 | |
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| 453. | Clandestine HUMINT operational techniques | Wikipedia audio article | 3 | |
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| 454. | Saint-Paulin cheese | Wikipedia audio article | 3 | |
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| 455. | Intel Itanium | Wikipedia audio article | 3 | |
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| 456. | Mauritius | Wikipedia audio article | 3 | |
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| 457. | Hydrogen isotope biogeochemistry | Wikipedia audio article | 3 | |
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| 458. | Wilhelm Frick | Wikipedia audio article | 3 | |
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| 459. | Cilicia | Wikipedia audio article | 3 | |
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| 460. | Inpui language | Wikipedia audio article | 3 | |
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| 461. | Jamadagni | Wikipedia audio article | 3 | |
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| 462. | Racial integration | Wikipedia audio article | 3 | |
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| 463. | Odoacer | Wikipedia audio article | 3 | |
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| 464. | Bob Dylan | Wikipedia audio article | 3 | |
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| 465. | Henry Wadsworth Longfellow | Wikipedia audio article | 3 | |
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| 466. | Pindar | Wikipedia audio article | 3 | |
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| 467. | World War II in Yugoslavia | Wikipedia audio article | 3 | |
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| 468. | Permittivity of free space | Wikipedia audio article | 3 | |
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| 469. | Insular Celts | Wikipedia audio article | 3 | |
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| 470. | Hittites | Wikipedia audio article | 3 | |
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| 471. | Sea of Okhotsk | Wikipedia audio article | 3 | |
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| 472. | Fuzzy mathematics | Wikipedia audio article | 3 | |
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| 473. | Ethnic groups in Europe | Wikipedia audio article | 3 | |
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| 474. | Bermuda | Wikipedia audio article | 3 | |
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| 475. | Corps of Indian Engineers | Wikipedia audio article | 3 | |
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| 476. | Earth's inner core | Wikipedia audio article | 3 | |
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| 477. | Uniforms of the United States Marine Corps | Wikipedia audio article | 3 | |
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| 478. | Yevanic language | Wikipedia audio article | 3 | |
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| 479. | Stephenville International Airport | Wikipedia audio article | 3 | |
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| 480. | World War III | Wikipedia audio article | 3 | |
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| 481. | Cagayan Valley languages | Wikipedia audio article | 3 | |
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| 482. | Heaven | Wikipedia audio article | 3 | |
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| 483. | Karbon (software) | Wikipedia audio article | 3 | |
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| 484. | Flag of the Hudson's Bay Company | Wikipedia audio article | 3 | |
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| 485. | World human population | Wikipedia audio article | 3 | |
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| 486. | Malvi language | Wikipedia audio article | 3 | |
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| 487. | Lal-lo and Gattaran Shell Middens | Wikipedia audio article | 3 | |
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| 488. | Tracker (music software) | Wikipedia audio article | 3 | |
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| 489. | Oberon (moon) | Wikipedia audio article | Wikipedia audio article | 3 | |
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| 490. | National Iranian Petrochemical Company | Wikipedia audio article | 3 | |
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| 491. | Internet Adult Film Database | Wikipedia audio article | 3 | |
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| 492. | Ancient Libya | Wikipedia audio article | 3 | |
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| 493. | China Civil Engineering Construction | Wikipedia audio article | 3 | |
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| 494. | Thurible | Wikipedia audio article | 3 | |
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| 495. | American Airlines Flight 965 | Wikipedia audio article | 3 | |
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| 496. | Alfred Vail | Wikipedia audio article | 3 | |
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| 497. | Defence Institute of Physiology and Allied Sciences | Wikipedia audio article | 3 | Vlog |
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| 498. | Williams V-Jet II | Wikipedia audio article | 3 | |
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| 499. | Hindustan Petroleum | Wikipedia audio article | 3 | |
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| 500. | Benjamin Peary Pal | Wikipedia audio article | 3 | |
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