| 401. | Chandogya Upanishad | Wikipedia audio article | Wikipedia audio article | 57:02 | |
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| 402. | Philippine Senate election, 2013 | Wikipedia audio article | 57:01 | |
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| 403. | Global food crisis | Wikipedia audio article | 56:59 | |
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| 404. | Cricket | Wikipedia audio article | 56:52 | |
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| 405. | Political status of Puerto Rico | Wikipedia audio article | 56:50 | |
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| 406. | Boris Yeltsin | Wikipedia audio article | 56:48 | |
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| 407. | Nontrinitarianism | Wikipedia audio article | 56:43 | |
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| 408. | Autoethnography | Wikipedia audio article | 56:41 | |
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| 409. | Catholic Church in the United States | Wikipedia audio article | 56:35 | |
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| 410. | Scientific creationism | Wikipedia audio article | 56:33 | |
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| 411. | Rimini | Wikipedia audio article | 56:22 | |
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| 412. | Propeller | Wikipedia audio article | 56:17 | |
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| 413. | World Health Organization's list of essential medicines | Wikipedia audio article | 56:17 | |
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| 414. | Anthropology | Wikipedia audio article | 56:11 | Vlog |
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| 415. | Network analysis (electrical circuits) | Wikipedia audio article | 56:09 | |
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| 416. | Josephus on Jesus | Wikipedia audio article | 56:09 | |
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| 417. | United Nations | Wikipedia audio article | 56:00 | |
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| 418. | Seal hunting | Wikipedia audio article | 55:52 | |
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| 419. | Folklore | Wikipedia audio article | 55:51 | |
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| 420. | Pierre Laval | Wikipedia audio article | 55:49 | |
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| 421. | AOL | Wikipedia audio article | 55:47 | |
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| 422. | Sex education | Wikipedia audio article | 55:46 | | QUIZ PRO! - General Knowledge
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| 423. | Edison Electric Light Company | Wikipedia audio article | 55:43 | |
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| 424. | Botany | Wikipedia audio article | 55:37 | |
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| 425. | Samizdat | Wikipedia audio article | 55:37 | |
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| 426. | Neutron | Wikipedia audio article | 55:24 | |
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| 427. | Efficient energy use | Wikipedia audio article | 55:17 | |
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| 428. | Richard Mentor Johnson | Wikipedia audio article | 55:02 | |
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| 429. | Mongol | Wikipedia audio article | 55:01 | |
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| 430. | Linus Carl Pauling | Wikipedia audio article | 55:01 | |
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| 431. | ICD-10 Chapter I: Certain infectious and parasitic diseases | Wikipedia audio article | 54:59 | |
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| 432. | Comcast | Wikipedia audio article | 54:44 | |
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| 433. | Science fiction film | Wikipedia audio article | 54:44 | |
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| 434. | Vedanta | Wikipedia audio article | 54:38 | |
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| 435. | Vajrayana | Wikipedia audio article | Wikipedia audio article | 54:34 | |
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| 436. | First Crusade | Wikipedia audio article | 54:33 | |
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| 437. | Cyborg | Wikipedia audio article | 54:29 | |
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| 438. | Guinea | Wikipedia audio article | 54:24 | |
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| 439. | Glucose | Wikipedia audio article | 54:14 | |
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| 440. | World Trade Center (PATH station) | Wikipedia audio article | 54:11 | |
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| 441. | Brahman | Wikipedia audio article | 54:05 | |
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| 442. | Great Lakes | Wikipedia audio article | 54:01 | |
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| 443. | Shiva | Wikipedia audio article | 54:00 | |
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| 444. | Mexico City earthquake | Wikipedia audio article | 53:54 | |
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| 445. | STS-132 | Wikipedia audio article | 53:52 | |
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| 446. | Gauge field theories | Wikipedia audio article | 53:51 | |
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| 447. | Brunei | Wikipedia audio article | 53:50 | |
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| 448. | Prague | Wikipedia audio article | 53:48 | |
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| 449. | Emotional intelligence | Wikipedia audio article | 53:43 | |
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| 450. | Thomas Jefferson and slavery | Wikipedia audio article | 53:32 | |
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| 451. | Djibouti | Wikipedia audio article | 53:30 | |
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| 452. | Liberalism worldwide | Wikipedia audio article | 53:29 | |
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| 453. | Persecution of Buddhists | Wikipedia audio article | Wikipedia audio article | 53:27 | |
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| 454. | Djibouti | Wikipedia audio article | 53:26 | |
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| 455. | Pashtuns | Wikipedia audio article | 53:16 | |
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| 456. | Solar System | Wikipedia audio article | 53:15 | |
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| 457. | Video game industry | Wikipedia audio article | 53:12 | |
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| 458. | Ulema | Wikipedia audio article | 53:12 | |
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| 459. | Bihar | Wikipedia audio article | 53:09 | |
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| 460. | Goa | Wikipedia audio article | 53:04 | |
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| 461. | Grid energy storage | Wikipedia audio article | 53:03 | |
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| 462. | Yogacara | Wikipedia audio article | 53:00 | |
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| 463. | Timeline of diving technology | Wikipedia audio article | 53:00 | Vlog |
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| 464. | Creation biology | Wikipedia audio article | 52:58 | Vlog |
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| 465. | Public health | Wikipedia audio article | 52:55 | |
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| 466. | Firearm | Wikipedia audio article | 52:54 | |
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| 467. | Dartmouth College | Wikipedia audio article | 52:22 | |
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| 468. | California Environmental Quality Act | Wikipedia audio article | 52:21 | |
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| 469. | Bioastronomy | Wikipedia audio article | 52:20 | |
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| 470. | Speed limit | Wikipedia audio article | 52:10 | |
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| 471. | Botswana | Wikipedia audio article | 52:09 | |
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| 472. | Sahara | Wikipedia audio article | 52:09 | |
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| 473. | Peru | Wikipedia audio article | 52:03 | |
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| 474. | Luxembourg | Wikipedia audio article | 52:03 | |
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| 475. | Calvin Coolidge | Wikipedia audio article | 52:02 | |
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| 476. | Dowry | Wikipedia audio article | 52:01 | |
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| 477. | Parliament of the United Kingdom | Wikipedia audio article | 51:59 | |
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| 478. | Ho Chi Minh City | Wikipedia audio article | 51:56 | |
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| 479. | List of human spaceflight programs | Wikipedia audio article | 51:55 | |
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| 480. | Pythagoreanism | Wikipedia audio article | 51:55 | |
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| 481. | Point source water pollution | Wikipedia audio article | 51:53 | |
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| 482. | Tulsidas | Wikipedia audio article | 51:52 | |
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| 483. | Dzogchen | Wikipedia audio article | 51:49 | |
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| 484. | Presbyterianism | Wikipedia audio article | 51:45 | |
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| 485. | Benjamin Butler (politician) | Wikipedia audio article | 51:41 | |
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| 486. | Brāhmī script | Wikipedia audio article | 51:33 | |
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| 487. | Pu'er tea | Wikipedia audio article | 51:27 | |
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| 488. | Aluminum | Wikipedia audio article | 51:24 | |
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| 489. | Latin | Wikipedia audio article | 51:21 | |
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| 490. | Andes | Wikipedia audio article | 51:21 | |
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| 491. | Major League Soccer | Wikipedia audio article | 51:19 | |
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| 492. | Good and evil | Wikipedia audio article | 51:18 | |
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| 493. | Islamic feminism | Wikipedia audio article | 51:10 | |
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| 494. | Marketing research | Wikipedia audio article | 51:09 | |
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| 495. | Lung | Wikipedia audio article | 51:09 | |
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| 496. | University of Queensland | Wikipedia audio article | 51:09 | |
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| 497. | Genetics | Wikipedia audio article | 51:05 | |
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| 498. | Freedom suit | Wikipedia audio article | 50:57 | |
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| 499. | Cameroon | Wikipedia audio article | 50:56 | |
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| 500. | Maya religion | Wikipedia audio article | 50:55 | |
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