| 401. | National Defense Act of 1916 | Wikipedia audio article | 3 | |
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| 402. | United States presidential election, 1788–89 | Wikipedia audio article | 3 | |
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| 403. | Robert Guiscard | Wikipedia audio article | 3 | |
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| 404. | Alfred Sturtevant | Wikipedia audio article | 3 | |
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| 405. | Ranthambore National Park | Wikipedia audio article | 3 | |
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| 406. | Timber Culture Act | Wikipedia audio article | 3 | |
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| 407. | New Zealand Mathematical Society | Wikipedia audio article | 3 | |
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| 408. | Environmental engineering | Wikipedia audio article | 3 | |
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| 409. | Abel–Ruffini theorem | Wikipedia audio article | 3 | |
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| 410. | Senator Rene Cayetano Science and Technology High School | Wikipedia audio article | 3 | Vlog |
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| 411. | Gopaldas Ambaidas Desai | Wikipedia audio article | 3 | |
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| 412. | Green Lantern: The Animated Series | Wikipedia audio article | 3 | |
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| 413. | Henri Lefebvre | Wikipedia audio article | 3 | |
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| 414. | Louis VII of France | Wikipedia audio article | 3 | |
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| 415. | Thomas Edison | Wikipedia audio article | 3 | |
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| 416. | Johann Most | Wikipedia audio article | 3 | |
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| 417. | Timeline of electromagnetic theory | Wikipedia audio article | 3 | |
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| 418. | Harold Urey | Wikipedia audio article | 3 | |
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| 419. | Léon Walras | Wikipedia audio article | 3 | |
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| 420. | A. Sreedhara Menon | Wikipedia audio article | 3 | |
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| 421. | Legislative districts of Negros Occidental | Wikipedia audio article | 3 | |
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| 422. | Ahar caste | Wikipedia audio article | 3 | |
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| 423. | Dalecarlian runes | Wikipedia audio article | 3 | |
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| 424. | Pāli Canon | Wikipedia audio article | 3 | |
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| 425. | Pescennius Niger | Wikipedia audio article | 3 | |
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| 426. | Chemical pulping process | Wikipedia audio article | 3 | Let's Play |
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| 427. | Malaysian Airlines Flight 370 | Wikipedia audio article | 3 | |
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| 428. | Diethylstilbestrol | Wikipedia audio article | 3 | |
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| 429. | Antichrist | Wikipedia audio article | 3 | |
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| 430. | Stasi | Wikipedia audio article | 3 | |
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| 431. | Space Shuttle Columbia accident | Wikipedia audio article | 3 | |
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| 432. | Sonia Greene | Wikipedia audio article | 3 | |
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| 433. | Silk Road transmission of Buddhism | Wikipedia audio article | Wikipedia audio article | 3 | |
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| 434. | Game theory | Wikipedia audio article | 3 | |
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| 435. | Illanun people | Wikipedia audio article | 3 | |
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| 436. | Tribal religions in India | Wikipedia audio article | 3 | |
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| 437. | The Compendious Book on Calculation by Completion and Balancing | Wikipedia audio article | 3 | |
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| 438. | Philippine Navy | Wikipedia audio article | 3 | |
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| 439. | Bhutan | Wikipedia audio article | 3 | |
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| 440. | Hokan languages | Wikipedia audio article | 3 | |
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| 441. | Cretaceous–Paleogene extinction event | Wikipedia audio article | 3 | |
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| 442. | Eastern Orthodox Church | Wikipedia audio article | 3 | |
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| 443. | Congregation of Our Lady of Charity of the Good Shepherd | Wikipedia audio article | 3 | |
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| 444. | Grid Compass | Wikipedia audio article | 3 | |
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| 445. | Henri La Fontaine | Wikipedia audio article | 3 | |
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| 446. | Philippine Constitutional Convention election, 1934 | Wikipedia audio article | 3 | |
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| 447. | Journal of the Science of Food and Agriculture | Wikipedia audio article | 3 | |
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| 448. | Primitive communism | Wikipedia audio article | 3 | |
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| 449. | Camille Bulcke | Wikipedia audio article | 3 | |
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| 450. | Lists of tenants in the World Trade Center (1973–2001) | Wikipedia audio article | 3 | |
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| 451. | Green Standard Army | Wikipedia audio article | 3 | |
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| 452. | Marsala wine | Wikipedia audio article | 3 | |
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| 453. | International Astronomical Union | Wikipedia audio article | 3 | |
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| 454. | Western Roman Empire | Wikipedia audio article | 3 | |
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| 455. | Voiceless bilabial trill | Wikipedia audio article | 3 | |
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| 456. | National Police Academy of Pakistan | Wikipedia audio article | 3 | |
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| 457. | Bird's Head Peninsula | Wikipedia audio article | 3 | |
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| 458. | Japanese occupation of the Philippines | Wikipedia audio article | 3 | |
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| 459. | Charles Dupuy | Wikipedia audio article | 3 | |
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| 460. | Tetrahydrozoline | Wikipedia audio article | 3 | |
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| 461. | Mosaic authorship | Wikipedia audio article | 3 | |
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| 462. | Caucasian Iberia | Wikipedia audio article | 3 | |
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| 463. | List of Roman Catholic cleric-scientists | Wikipedia audio article | 3 | |
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| 464. | José Coronel Urtecho | Wikipedia audio article | 3 | |
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| 465. | Quality Protein Maize | Wikipedia audio article | 3 | |
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| 466. | Tanoan languages | Wikipedia audio article | 3 | |
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| 467. | Mohism | Wikipedia audio article | 3 | |
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| 468. | Azerbaijan Soviet Socialist Republic | Wikipedia audio article | 3 | |
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| 469. | History of computer and video games | Wikipedia audio article | 3 | |
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| 470. | Richard D. Ryder | Wikipedia audio article | 3 | |
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| 471. | Tai Daeng language | Wikipedia audio article | 3 | |
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| 472. | Islamic banking and finance | Wikipedia audio article | 3 | |
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| 473. | John Quincy Adams | Wikipedia audio article | 3 | |
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| 474. | Institute for Creation Research | Wikipedia audio article | 3 | |
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| 475. | RD-58 | Wikipedia audio article | 3 | |
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| 476. | Technicolor | Wikipedia audio article | 3 | |
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| 477. | Malvar, Batangas | Wikipedia audio article | 3 | |
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| 478. | China | Wikipedia audio article | 3 | |
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| 479. | 1960 Valdivia earthquake | Wikipedia audio article | 3 | |
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| 480. | Thomas J. Kelly (aerospace engineer) | Wikipedia audio article | 3 | |
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| 481. | Extreme helium star | Wikipedia audio article | 3 | |
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| 482. | San Jose, Batangas | Wikipedia audio article | 3 | |
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| 483. | History of chemical warfare | Wikipedia audio article | 3 | |
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| 484. | Iran | Wikipedia audio article | 3 | |
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| 485. | Oregon Electric Railway | Wikipedia audio article | 3 | |
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| 486. | Muslim Brotherhood | Wikipedia audio article | 3 | |
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| 487. | LK (spacecraft) | Wikipedia audio article | 3 | | SPACE Craft
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| 488. | Spanish transition to democracy | Wikipedia audio article | 3 | |
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| 489. | King George High School, Dadar(E) | Wikipedia audio article | 3 | |
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| 490. | Osama bin Laden death conspiracy theories | Wikipedia audio article | 3 | |
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| 491. | Sutlej river | Wikipedia audio article | 3 | |
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| 492. | North Africa | Wikipedia audio article | 3 | |
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| 493. | Aragh Sagi | Wikipedia audio article | 3 | |
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| 494. | Philip VI of France | Wikipedia audio article | 3 | |
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| 495. | Alcohol fuel | Wikipedia audio article | 3 | |
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| 496. | Baghdad | Wikipedia audio article | 3 | |
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| 497. | Pashupata Shaivism | Wikipedia audio article | 3 | |
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| 498. | Uniforms of the United States Army | Wikipedia audio article | 3 | |
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| 499. | De Havilland Mosquito | Wikipedia audio article | 3 | |
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| 500. | Odinani | Wikipedia audio article | 3 | |
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